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Reference.org
Query language
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<p>A query language, also known as data query language or database query language (DQL), is a <a href="/facts/Computer_language/n3L56qdP">computer language</a> used to make queries in <a href="/facts/Database/VYcpkevb">databases</a> and <a href="/facts/Information_system/apcSzFLh">information systems</a>. In database systems, query languages rely on strict theory to retrieve information. A well known example is the <a href="/facts/Structured_Query_Language/UjQLJcYm">Structured Query Language</a> (SQL). </p>