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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_constraint.sgml,v 1.9 2003/04/22 10:08:08 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-CREATECONSTRAINT">
<refmeta>
<refentrytitle id="sql-createconstraint-title">CREATE CONSTRAINT TRIGGER</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>CREATE CONSTRAINT TRIGGER</refname>
<refpurpose>define a new constraint trigger</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
CREATE CONSTRAINT TRIGGER <replaceable class="parameter">name</replaceable>
AFTER <replaceable class="parameter">events</replaceable> ON
<replaceable class="parameter">table</replaceable> <replaceable class="parameter">constraint</replaceable> <replaceable class="parameter">attributes</replaceable>
FOR EACH ROW EXECUTE PROCEDURE <replaceable class="parameter">func</replaceable> ( <replaceable class="parameter">args</replaceable> )
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>CREATE CONSTRAINT TRIGGER</command> is used within
<command>CREATE TABLE</command>/<command>ALTER TABLE</command> and by
<application>pg_dump</application> to create the special triggers for
referential integrity.
It is not intended for general use.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of the constraint trigger.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">events</replaceable></term>
<listitem>
<para>
The event categories for which this trigger should be fired.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">table</replaceable></term>
<listitem>
<para>
The name (possibly schema-qualified) of the table in which
the triggering events occur.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">constraint</replaceable></term>
<listitem>
<para>
Actual constraint specification.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">attributes</replaceable></term>
<listitem>
<para>
The constraint attributes.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">func</replaceable>(<replaceable class="PARAMETER">args</replaceable>)</term>
<listitem>
<para>
The function to call as part of the trigger processing.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<variablelist>
<varlistentry>
<term><computeroutput>CREATE TRIGGER</computeroutput></term>
<listitem>
<para>
Message returned if successful.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
</refentry>
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