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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>37.8. Procedural Language Functions</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="xfunc-volatility.html" title="37.7. Function Volatility Categories" /><link rel="next" href="xfunc-internal.html" title="37.9. Internal Functions" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.8. Procedural Language Functions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="xfunc-volatility.html" title="37.7. Function Volatility Categories">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="extend.html" title="Chapter 37. Extending SQL">Up</a></td><th width="60%" align="center">Chapter 37. Extending <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">SQL</acronym></th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="xfunc-internal.html" title="37.9. Internal Functions">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="XFUNC-PL"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.8. Procedural Language Functions</h2></div></div></div><p>
<span class="productname">PostgreSQL</span> allows user-defined functions
to be written in other languages besides SQL and C. These other
languages are generically called <em class="firstterm">procedural
languages</em> (<acronym class="acronym">PL</acronym>s).
Procedural languages aren't built into the
<span class="productname">PostgreSQL</span> server; they are offered
by loadable modules.
See <a class="xref" href="xplang.html" title="Chapter 41. Procedural Languages">Chapter 41</a> and following chapters for more
information.
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