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<title>CREATE CONSTRAINT TRIGGER</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<a name="sql-createconstraint"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>CREATE CONSTRAINT TRIGGER — define a new constraint trigger</p>
</div>
<a name="id753675"></a><div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">CREATE CONSTRAINT TRIGGER <em class="replaceable"><code>name</code></em>
AFTER <em class="replaceable"><code>events</code></em> ON
<em class="replaceable"><code>tablename</code></em> <em class="replaceable"><code>constraint</code></em> <em class="replaceable"><code>attributes</code></em>
FOR EACH ROW EXECUTE PROCEDURE <em class="replaceable"><code>funcname</code></em> ( <em class="replaceable"><code>args</code></em> )</pre>
</div>
<div class="refsect1" lang="en">
<a name="id753741"></a><h2>Description</h2>
<p> <code class="command">CREATE CONSTRAINT TRIGGER</code> is used within
<code class="command">CREATE TABLE</code>/<code class="command">ALTER TABLE</code> and by
<span class="application">pg_dump</span> to create the special triggers for
referential integrity.
It is not intended for general use.
</p>
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<div class="refsect1" lang="en">
<a name="id753776"></a><h2>Parameters</h2>
<div class="variablelist"><dl>
<dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt>
<dd><p> The name of the constraint trigger.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>events</code></em></span></dt>
<dd><p> The event categories for which this trigger should be fired.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>tablename</code></em></span></dt>
<dd><p> The name (possibly schema-qualified) of the table in which
the triggering events occur.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>constraint</code></em></span></dt>
<dd><p> Actual constraint specification.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>attributes</code></em></span></dt>
<dd><p> The constraint attributes.
</p></dd>
<dt><span class="term"><em class="replaceable"><code>funcname</code></em>(<em class="replaceable"><code>args</code></em>)</span></dt>
<dd><p> The function to call as part of the trigger processing.
</p></dd>
</dl></div>
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