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3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/category/features"><span itemprop="name">Features</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/managed-datahub/observe/assertions"><span itemprop="name">Assertions (Data Quality)</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Open Assertions Specification</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>DataHub Open Data Quality Assertions Specification</h1><p>DataHub is developing an open-source Data Quality Assertions Specification & Compiler that will allow you to declare data quality checks / expectations / assertions using a simple, universal
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YAML-based format, and then compile this into artifacts that can be registered or directly executed by 3rd party Data Quality tools like <a href="https://docs.snowflake.com/en/user-guide/data-quality-intro" target="_blank" rel="noopener noreferrer">Snowflake DMFs</a>,
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dbt tests, Great Expectations or DataHub Cloud natively.</p><p>Ultimately, our goal is to provide an framework-agnostic, highly-portable format for defining Data Quality checks, making it seamless to swap out the underlying
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assertion engine without service disruption for end consumers of the results of these data quality checks in catalogging tools like DataHub.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="integrations">Integrations<a href="#integrations" class="hash-link" aria-label="Direct link to Integrations" title="Direct link to Integrations"></a></h2><p>Currently, the DataHub Open Assertions Specification supports the following integrations:</p><ul><li><a href="/docs/assertions/snowflake/snowflake_dmfs">Snowflake DMF Assertions</a></li></ul><p>And is looking for contributions to build out support for the following integrations:</p><ul><li>[Looking for Contributions]<!-- --> dbt tests</li><li>[Looking for Contributions]<!-- --> Great Expectation checks</li></ul><p>Below, we'll look at how to define assertions in YAML, and then provide an usage overview for each support integration.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="the-specification-declaring-data-quality-assertions-in-yaml">The Specification: Declaring Data Quality Assertions in YAML<a href="#the-specification-declaring-data-quality-assertions-in-yaml" class="hash-link" aria-label="Direct link to The Specification: Declaring Data Quality Assertions in YAML" title="Direct link to The Specification: Declaring Data Quality Assertions in YAML"></a></h2><p>The following assertion types are currently supported by the DataHub YAML Assertion spec:</p><ul><li><a href="/docs/managed-datahub/observe/freshness-assertions">Freshness</a></li><li><a href="/docs/managed-datahub/observe/volume-assertions">Volume</a></li><li><a href="/docs/managed-datahub/observe/column-assertions">Column</a></li><li><a href="/docs/managed-datahub/observe/custom-sql-assertions">Custom SQL</a></li><li><a href="/docs/managed-datahub/observe/schema-assertions">Schema</a></li></ul><p>Each assertion type aims to validate a different aspect of structured table (e.g. on a data warehouse or data lake), from
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structure to size to column integrity to custom metrics.</p><p>In this section, we'll go over examples of defining each.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="freshness-assertions">Freshness Assertions<a href="#freshness-assertions" class="hash-link" aria-label="Direct link to Freshness Assertions" title="Direct link to Freshness Assertions"></a></h3><p>Freshness Assertions allow you to verify that your data was updated within the expected timeframe.
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Below you'll find examples of defining different types of freshness assertions via YAML.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-that-table-is-updated-every-6-hours">Validating that Table is Updated Every 6 Hours<a href="#validating-that-table-is-updated-every-6-hours" class="hash-link" aria-label="Direct link to Validating that Table is Updated Every 6 Hours" title="Direct link to Validating that Table is Updated Every 6 Hours"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> freshness</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">lookback_interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">last_modified_field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> updated_at</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> interval</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run every 6 hours</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the <code>purchase_events</code> table in the <code>test_db.public</code> schema was updated within the last 6 hours
|
||
by issuing a Query to the table which validates determines whether an update was made using the <code>updated_at</code> column in the past 6 hours.
|
||
To use this check, we must specify the field that contains the last modified timestamp of a given row.</p><p>The <code>lookback_interval</code> field is used to specify the "lookback window" for the assertion, whereas the <code>schedule</code> field is used to specify how often the assertion should be run.
|
||
This allows you to schedule the assertion to run at a different frequency than the lookback window, for example
|
||
to detect stale data as soon as it becomes "stale" by inspecting it more frequently.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="supported-source-types">Supported Source Types<a href="#supported-source-types" class="hash-link" aria-label="Direct link to Supported Source Types" title="Direct link to Supported Source Types"></a></h4><p>Currently, the only supported <code>sourceType</code> for Freshness Assertions is <code>LAST_MODIFIED_FIELD</code>. In the future,
|
||
we may support additional source types, such as <code>HIGH_WATERMARK</code>, along with data source-specific types such as
|
||
<code>AUDIT_LOG</code> and <code>INFORMATION_SCHEMA</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="volume-assertions">Volume Assertions<a href="#volume-assertions" class="hash-link" aria-label="Direct link to Volume Assertions" title="Direct link to Volume Assertions"></a></h3><p>Volume Assertions allow you to verify that the number of records in your dataset meets your expectations.
|
||
Below you'll find examples of defining different types of volume assertions via YAML.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-that-tale-row-count-is-in-expected-range">Validating that Tale Row Count is in Expected Range<a href="#validating-that-tale-row-count-is-in-expected-range" class="hash-link" aria-label="Direct link to Validating that Tale Row Count is in Expected Range" title="Direct link to Validating that Tale Row Count is in Expected Range"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> volume</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"row_count"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> between</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">min</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">max</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">10000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run when new data is added to the table.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the <code>purchase_events</code> table in the <code>test_db.public</code> schema has between 1000 and 10000 records.
|
||
Using the <code>condition</code> field, you can specify the type of comparison to be made, and the <code>min</code> and <code>max</code> fields to specify the range of values to compare against.
|
||
Using the <code>filters</code> field, you can optionally specify a SQL WHERE clause to filter the records being counted.
|
||
Using the <code>schedule</code> field you can specify when the assertion should be run, either on a fixed schedule or when new data is added to the table.
|
||
The only metric currently supported is <code>row_count</code>.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-that-table-row-count-is-less-than-value">Validating that Table Row Count is Less Than Value<a href="#validating-that-table-row-count-is-less-than-value" class="hash-link" aria-label="Direct link to Validating that Table Row Count is Less Than Value" title="Direct link to Validating that Table Row Count is Less Than Value"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> volume</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"row_count"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> less_than_or_equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run when new data is added to the table.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-that-table-row-count-is-greater-than-value">Validating that Table Row Count is Greater Than Value<a href="#validating-that-table-row-count-is-greater-than-value" class="hash-link" aria-label="Direct link to Validating that Table Row Count is Greater Than Value" title="Direct link to Validating that Table Row Count is Greater Than Value"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> volume</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"row_count"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> greater_than_or_equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run when new data is added to the table.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="supported-conditions">Supported Conditions<a href="#supported-conditions" class="hash-link" aria-label="Direct link to Supported Conditions" title="Direct link to Supported Conditions"></a></h4><p>The full set of supported volume assertion conditions include:</p><ul><li><code>equal_to</code></li><li><code>not_equal_to</code></li><li><code>greater_than</code></li><li><code>greater_than_or_equal_to</code></li><li><code>less_than</code></li><li><code>less_than_or_equal_to</code></li><li><code>between</code></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="column-assertions">Column Assertions<a href="#column-assertions" class="hash-link" aria-label="Direct link to Column Assertions" title="Direct link to Column Assertions"></a></h3><p>Column Assertions allow you to verify that the values in a column meet your expectations.
|
||
Below you'll find examples of defining different types of column assertions via YAML.</p><p>The specification currently supports 2 types of Column Assertions:</p><ul><li><strong>Field Value</strong>: Asserts that the values in a column meet a specific condition.</li><li><strong>Field Metric</strong>: Asserts that a specific metric aggregated across the values in a column meet a specific condition.</li></ul><p>We'll go over examples of each below.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-values-assertion-validating-that-all-column-values-are-in-expected-range">Field Values Assertion: Validating that All Column Values are In Expected Range<a href="#field-values-assertion-validating-that-all-column-values-are-in-expected-range" class="hash-link" aria-label="Direct link to Field Values Assertion: Validating that All Column Values are In Expected Range" title="Direct link to Field Values Assertion: Validating that All Column Values are In Expected Range"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> amount</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> between</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">min</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">max</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">10</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">exclude_nulls</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token boolean important" style="color:rgb(255, 88, 116)">True</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># failure_threshold:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># type: count</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># value: 10</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that all values for the <code>amount</code> column in the <code>purchase_events</code> table in the <code>test_db.public</code> schema have values between 0 and 10.
|
||
Using the <code>field</code> field, you can specify the column to be asserted on, and using the <code>condition</code> field, you can specify the type of comparison to be made,
|
||
and the <code>min</code> and <code>max</code> fields to specify the range of values to compare against.
|
||
Using the <code>schedule</code> field you can specify when the assertion should be run, either on a fixed schedule or when new data is added to the table.
|
||
Using the <code>filters</code> field, you can optionally specify a SQL WHERE clause to filter the records being counted.
|
||
Using the <code>exclude_nulls</code> field, you can specify whether to exclude NULL values from the assertion, meaning that
|
||
NULL will simply be ignored if encountered, as opposed to failing the check.
|
||
Using the <code>failure_threshold</code>, we can set a threshold for the number of rows that can fail the assertion before the assertion is considered failed.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-values-assertion-validating-that-all-column-values-are-in-expected-set">Field Values Assertion: Validating that All Column Values are In Expected Set<a href="#field-values-assertion-validating-that-all-column-values-are-in-expected-set" class="hash-link" aria-label="Direct link to Field Values Assertion: Validating that All Column Values are In Expected Set" title="Direct link to Field Values Assertion: Validating that All Column Values are In Expected Set"></a></h4><p>The validate a VARCHAR / STRING column that should contain one of a set of values:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> product_id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> in</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"product_1"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"product_2"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"product_3"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">exclude_nulls</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token boolean important" style="color:rgb(255, 88, 116)">False</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># failure_threshold:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># type: count</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># value: 10</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-values-assertion-validating-that-all-column-values-are-email-addresses">Field Values Assertion: Validating that All Column Values are Email Addresses<a href="#field-values-assertion-validating-that-all-column-values-are-email-addresses" class="hash-link" aria-label="Direct link to Field Values Assertion: Validating that All Column Values are Email Addresses" title="Direct link to Field Values Assertion: Validating that All Column Values are Email Addresses"></a></h4><p>The validate a string column contains valid email addresses:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> email_address</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> matches_regex</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">exclude_nulls</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token boolean important" style="color:rgb(255, 88, 116)">False</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># failure_threshold:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># type: count</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># value: 10</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-values-assertion-supported-conditions">Field Values Assertion: Supported Conditions<a href="#field-values-assertion-supported-conditions" class="hash-link" aria-label="Direct link to Field Values Assertion: Supported Conditions" title="Direct link to Field Values Assertion: Supported Conditions"></a></h4><p>The full set of supported field value conditions include:</p><ul><li><code>in</code></li><li><code>not_in</code></li><li><code>is_null</code></li><li><code>is_not_null</code></li><li><code>equal_to</code></li><li><code>not_equal_to</code></li><li><code>greater_than</code> # Numeric Only</li><li><code>greater_than_or_equal_to</code> # Numeric Only</li><li><code>less_than</code> # Numeric Only</li><li><code>less_than_or_equal_to</code> # Numeric Only</li><li><code>between</code> # Numeric Only</li><li><code>matches_regex</code> # String Only</li><li><code>not_empty</code> # String Only</li><li><code>length_greater_than</code> # String Only</li><li><code>length_less_than</code> # String Only</li><li><code>length_between</code> # String Only</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-metric-assertion-validating-no-missing-values-in-column">Field Metric Assertion: Validating No Missing Values in Column<a href="#field-metric-assertion-validating-no-missing-values-in-column" class="hash-link" aria-label="Direct link to Field Metric Assertion: Validating No Missing Values in Column" title="Direct link to Field Metric Assertion: Validating No Missing Values in Column"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> col_date</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> null_count</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion ensures that the <code>col_date</code> column in the <code>purchase_events</code> table in the <code>test_db.public</code> schema has no NULL values.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-metric-assertion-validating-no-duplicates-in-column">Field Metric Assertion: Validating No Duplicates in Column<a href="#field-metric-assertion-validating-no-duplicates-in-column" class="hash-link" aria-label="Direct link to Field Metric Assertion: Validating No Duplicates in Column" title="Direct link to Field Metric Assertion: Validating No Duplicates in Column"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> unique_percentage</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">100</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion ensures that the <code>id</code> column in the <code>purchase_events</code> table in the <code>test_db.public</code> schema
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has no duplicates, by checking that the unique percentage is 100%.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-metric-assertion-validating-string-column-is-never-empty-string">Field Metric Assertion: Validating String Column is Never Empty String<a href="#field-metric-assertion-validating-string-column-is-never-empty-string" class="hash-link" aria-label="Direct link to Field Metric Assertion: Validating String Column is Never Empty String" title="Direct link to Field Metric Assertion: Validating String Column is Never Empty String"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> field</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">field</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> name</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">metric</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> empty_percentage</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># filters: "event_type = 'purchase'" Optionally add filters for Column Assertion.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> on_table_change</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion ensures that the <code>name</code> column in the <code>purchase_events</code> table in the <code>test_db.public</code> schema is never empty, by checking that the empty percentage is 0%.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="field-metric-assertion-supported-metrics">Field Metric Assertion: Supported Metrics<a href="#field-metric-assertion-supported-metrics" class="hash-link" aria-label="Direct link to Field Metric Assertion: Supported Metrics" title="Direct link to Field Metric Assertion: Supported Metrics"></a></h4><p>The full set of supported field metrics include:</p><ul><li><code>null_count</code></li><li><code>null_percentage</code></li><li><code>unique_count</code></li><li><code>unique_percentage</code></li><li><code>empty_count</code></li><li><code>empty_percentage</code></li><li><code>min</code></li><li><code>max</code></li><li><code>mean</code></li><li><code>median</code></li><li><code>stddev</code></li><li><code>negative_count</code></li><li><code>negative_percentage</code></li><li><code>zero_count</code></li><li><code>zero_percentage</code></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="field-metric-assertion-supported-conditions">Field Metric Assertion: Supported Conditions<a href="#field-metric-assertion-supported-conditions" class="hash-link" aria-label="Direct link to Field Metric Assertion: Supported Conditions" title="Direct link to Field Metric Assertion: Supported Conditions"></a></h3><p>The full set of supported field metric conditions include:</p><ul><li><code>equal_to</code></li><li><code>not_equal_to</code></li><li><code>greater_than</code></li><li><code>greater_than_or_equal_to</code></li><li><code>less_than</code></li><li><code>less_than_or_equal_to</code></li><li><code>between</code></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="custom-sql-assertions">Custom SQL Assertions<a href="#custom-sql-assertions" class="hash-link" aria-label="Direct link to Custom SQL Assertions" title="Direct link to Custom SQL Assertions"></a></h3><p>Custom SQL Assertions allow you to define custom SQL queries to verify your data meets your expectations.
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The only condition is that the SQL query must return a single value, which will be compared against the expected value.
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Below you'll find examples of defining different types of custom SQL assertions via YAML.</p><p>SQL Assertions are useful for more complex data quality checks that can't be easily expressed using the other assertion types,
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and can be used to assert on custom metrics, complex aggregations, cross-table integrity checks (JOINS) or any other SQL-based data quality check.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-foreign-key-integrity">Validating Foreign Key Integrity<a href="#validating-foreign-key-integrity" class="hash-link" aria-label="Direct link to Validating Foreign Key Integrity" title="Direct link to Validating Foreign Key Integrity"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> sql</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">statement</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">|</span><span class="token scalar string" style="color:rgb(195, 232, 141)"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> SELECT COUNT(*)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> FROM test_db.public.purchase_events AS pe</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> LEFT JOIN test_db.public.products AS p</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> ON pe.product_id = p.id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> WHERE p.id IS NULL</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> interval</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run every 6 hours</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the <code>purchase_events</code> table in the <code>test_db.public</code> schema has no rows where the <code>product_id</code> column does not have a corresponding <code>id</code> in the <code>products</code> table.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="comparing-row-counts-across-multiple-tables">Comparing Row Counts Across Multiple Tables<a href="#comparing-row-counts-across-multiple-tables" class="hash-link" aria-label="Direct link to Comparing Row Counts Across Multiple Tables" title="Direct link to Comparing Row Counts Across Multiple Tables"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> sql</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">statement</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">|</span><span class="token scalar string" style="color:rgb(195, 232, 141)"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> SELECT COUNT(*) FROM test_db.public.purchase_events</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token scalar string" style="color:rgb(195, 232, 141)"> - (SELECT COUNT(*) FROM test_db.public.purchase_events_raw) AS row_count_difference</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> equal_to</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">value</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> interval</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run every 6 hours</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the number of rows in the <code>purchase_events</code> exactly matches the number of rows in an upstream <code>purchase_events_raw</code> table
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by subtracting the row count of the raw table from the row count of the processed table.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="supported-conditions-1">Supported Conditions<a href="#supported-conditions-1" class="hash-link" aria-label="Direct link to Supported Conditions" title="Direct link to Supported Conditions"></a></h4><p>The full set of supported custom SQL assertion conditions include:</p><ul><li><code>equal_to</code></li><li><code>not_equal_to</code></li><li><code>greater_than</code></li><li><code>greater_than_or_equal_to</code></li><li><code>less_than</code></li><li><code>less_than_or_equal_to</code></li><li><code>between</code></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-assertions-coming-soon">Schema Assertions (Coming Soon)<a href="#schema-assertions-coming-soon" class="hash-link" aria-label="Direct link to Schema Assertions (Coming Soon)" title="Direct link to Schema Assertions (Coming Soon)"></a></h3><p>Schema Assertions allow you to define custom SQL queries to verify your data meets your expectations.
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Below you'll find examples of defining different types of custom SQL assertions via YAML.</p><p>The specification currently supports 2 types of Schema Assertions:</p><ul><li><strong>Exact Match</strong>: Asserts that the schema of a table - column names and their data types - exactly matches an expected schema</li><li><strong>Contains Match</strong> (Subset): Asserts that the schema of a table - column names and their data types - is a subset of an expected schema</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-actual-schema-exactly-equals-expected-schema">Validating Actual Schema Exactly Equals Expected Schema<a href="#validating-actual-schema-exactly-equals-expected-schema" class="hash-link" aria-label="Direct link to Validating Actual Schema Exactly Equals Expected Schema" title="Direct link to Validating Actual Schema Exactly Equals Expected Schema"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> schema</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> exact_match</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">columns</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> INTEGER</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> product_id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> STRING</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> amount</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> DECIMAL</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> updated_at</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> TIMESTAMP</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> interval</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run every 6 hours</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the <code>purchase_events</code> table in the <code>test_db.public</code> schema has the exact schema as specified, with the exact column names and data types.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="validating-actual-schema-is-contains-all-of-expected-schema">Validating Actual Schema is Contains all of Expected Schema<a href="#validating-actual-schema-is-contains-all-of-expected-schema" class="hash-link" aria-label="Direct link to Validating Actual Schema is Contains all of Expected Schema" title="Direct link to Validating Actual Schema is Contains all of Expected Schema"></a></h4><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token key atrule">assertions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">(urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">li</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">dataPlatform</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain">snowflake</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">test_db.public.purchase_events</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain">PROD)</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> schema</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">condition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> contains</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">columns</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> integer</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> product_id</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> string</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> amount</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> number</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">schedule</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">type</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> interval</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"6 hours"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run every 6 hours</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This assertion checks that the <code>purchase_events</code> table in the <code>test_db.public</code> schema contains all of the columns specified in the expected schema, with the exact column names and data types.
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The actual schema can also contain additional columns not specified in the expected schema.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="supported-data-types">Supported Data Types<a href="#supported-data-types" class="hash-link" aria-label="Direct link to Supported Data Types" title="Direct link to Supported Data Types"></a></h4><p>The following high-level data types are currently supported by the Schema Assertion spec:</p><ul><li>string</li><li>number</li><li>boolean</li><li>date</li><li>timestamp</li><li>struct</li><li>array</li><li>map</li><li>union</li><li>bytes</li><li>enum</li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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