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Query evaluation
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<p>In <a href="/facts/Database_theory/unyQa3cK">database theory</a>, the query evaluation problem is the <a href="/facts/Computational_problem/jQ7bYUVh">problem</a>[<i>verification needed</i>] of determining the answers to a query on a database. Research in database theory aims at determining the <a href="/facts/Computational_complexity/Qenh22Ja">computational complexity</a> of answering different kinds of queries over databases, in particular over <a href="/facts/Relational_database/pEKGmJLy">relational databases</a>. </p>