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<p>logic programming languages, such as <a href="page.php?w=Prolog">Prolog</a>, and database query languages, such as SQL, while declarative in principle, also support a procedural style of programming.</p>

<p><big>Subparadigms</big></p>
<p>Declarative programming is an <a href="page.php?w=umbrella_term">umbrella term</a> that includes a number of better-known <a href="page.php?w=programming_paradigm">programming paradigm</a>s.</p>

<p><big>Constraint programming</big></p>
<p>Constraint programming states relations between variables in the form of constraints that</p><p>
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