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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>9.14. UUID 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="functions-textsearch.html" title="9.13. Text Search Functions and Operators" /><link rel="next" href="functions-xml.html" title="9.15. XML 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">9.14. UUID Functions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="functions-textsearch.html" title="9.13. Text Search Functions and Operators">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="functions.html" title="Chapter 9. Functions and Operators">Up</a></td><th width="60%" align="center">Chapter 9. Functions and Operators</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="functions-xml.html" title="9.15. XML Functions">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="FUNCTIONS-UUID"><div class="titlepage"><div><div><h2 class="title" style="clear: both">9.14. UUID Functions</h2></div></div></div><a id="id-1.5.8.20.2" class="indexterm"></a><a id="id-1.5.8.20.3" class="indexterm"></a><p>
<span class="productname">PostgreSQL</span> includes one function to generate a UUID:
</p><pre class="synopsis">
<code class="function">gen_random_uuid</code> () → <code class="returnvalue">uuid</code>
</pre><p>
This function returns a version 4 (random) UUID. This is the most commonly
used type of UUID and is appropriate for most applications.
</p><p>
The <a class="xref" href="uuid-ossp.html" title="F.44. uuid-ossp">uuid-ossp</a> module provides additional functions that
implement other standard algorithms for generating UUIDs.
</p><p>
<span class="productname">PostgreSQL</span> also provides the usual comparison
operators shown in <a class="xref" href="functions-comparison.html#FUNCTIONS-COMPARISON-OP-TABLE" title="Table 9.1. Comparison Operators">Table 9.1</a> for
UUIDs.
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