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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>Chapter 39. Event Triggers</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="trigger-example.html" title="38.4. A Complete Trigger Example" /><link rel="next" href="event-trigger-definition.html" title="39.1. Overview of Event Trigger Behavior" /></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">Chapter 39. Event Triggers</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="trigger-example.html" title="38.4. A Complete Trigger Example">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><th width="60%" align="center">Part V. Server Programming</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="event-trigger-definition.html" title="39.1. Overview of Event Trigger Behavior">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="EVENT-TRIGGERS"><div class="titlepage"><div><div><h2 class="title">Chapter 39. Event Triggers</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="event-trigger-definition.html">39.1. Overview of Event Trigger Behavior</a></span></dt><dt><span class="sect1"><a href="event-trigger-matrix.html">39.2. Event Trigger Firing Matrix</a></span></dt><dt><span class="sect1"><a href="event-trigger-interface.html">39.3. Writing Event Trigger Functions in C</a></span></dt><dt><span class="sect1"><a href="event-trigger-example.html">39.4. A Complete Event Trigger Example</a></span></dt><dt><span class="sect1"><a href="event-trigger-table-rewrite-example.html">39.5. A Table Rewrite Event Trigger Example</a></span></dt></dl></div><a id="id-1.8.5.2" class="indexterm"></a><p>
+ To supplement the trigger mechanism discussed in <a class="xref" href="triggers.html" title="Chapter 38. Triggers">Chapter 38</a>,
+ <span class="productname">PostgreSQL</span> also provides event triggers. Unlike regular
+ triggers, which are attached to a single table and capture only DML events,
+ event triggers are global to a particular database and are capable of
+ capturing DDL events.
+ </p><p>
+ Like regular triggers, event triggers can be written in any procedural
+ language that includes event trigger support, or in C, but not in plain
+ SQL.
+ </p></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="trigger-example.html" title="38.4. A Complete Trigger Example">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="event-trigger-definition.html" title="39.1. Overview of Event Trigger Behavior">Next</a></td></tr><tr><td width="40%" align="left" valign="top">38.4. A Complete Trigger Example </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 39.1. Overview of Event Trigger Behavior</td></tr></table></div></body></html> \ No newline at end of file