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<h2><a class="header" href="#data-tests" id="data-tests">Data tests</a></h2>
<p>Data tests are <code>ASSERT</code> statements that you can run on your database tables and views and perform checks on data quality, recency, etc. Assert statements checks the result of a condition - a boolean expression.
Assert-based testing are enabled for every backend, they are translated by PowerSQL to queries return a
boolean.</p>
<p>Some examples:</p>
<pre><code class="language-sql">-- Column should be NOT NULL
ASSERT NOT EXISTS(
SELECT X
FROM t
WHERE column IS NULL
) AS 'column should be non null';
ASSERT NOT EXISTS (
SELECT quantity
FROM rev_per_product
WHERE quantity <= 0
) AS 'quantity should be positive';
ASSERT NOT EXISTS (
SELECT product_id
FROM rev_per_product
WHERE product_id IS NULL
) AS 'product_id should be not null';
ASSERT (
SELECT COUNT (*)
FROM rev_per_product
WHERE quantity < 10
) >= 0.7 * (
SELECT COUNT(*)
FROM rev_per_product
) AS 'At least 70% should have a quantity lower than 10'
</code></pre>
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