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<h1 class="topictitle1">Flattening VALUES subqueries</h1>


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<p><span>Derby</span> flattens VALUES subqueries to improve performance.</p>

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<div class="parentlink"><strong>Parent topic:</strong> <a href="ctuntransform13699.html" title="">Subquery processing and transformations</a></div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="ctuntransform25857.html" title="Materialization means that a subquery is evaluated only once. There are several types of subqueries that can be materialized.">Materialization</a></div>
<div><a href="ctuntransform36368.html" title="">Flattening a subquery into a normal join</a></div>
<div><a href="ctuntransform25868.html" title="">Flattening a subquery into an EXISTS join</a></div>
<div><a href="ctuntransform867165.html" title="">DISTINCT elimination in IN, ANY, and EXISTS subqueries</a></div>
<div><a href="ctuntransform867201.html" title="">IN/ANY subquery transformation</a></div>
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