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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/drop_trigger.sgml,v 1.24 2010/04/03 07:23:01 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPTRIGGER">
<refmeta>
<refentrytitle>DROP TRIGGER</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP TRIGGER</refname>
<refpurpose>remove a trigger</refpurpose>
</refnamediv>
<indexterm zone="sql-droptrigger">
<primary>DROP TRIGGER</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
DROP TRIGGER [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> ON <replaceable class="PARAMETER">table</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP TRIGGER</command> removes an existing
trigger definition. To execute this command, the current
user must be the owner of the table for which the trigger is defined.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>IF EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if the trigger does not exist. A notice is issued
in this case.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of the trigger to remove.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">table</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of the table for which
the trigger is defined.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the trigger.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the trigger if any objects depend on it. This is
the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="SQL-DROPTRIGGER-examples">
<title>Examples</title>
<para>
Destroy the trigger <literal>if_dist_exists</literal> on the table
<literal>films</literal>:
<programlisting>
DROP TRIGGER if_dist_exists ON films;
</programlisting>
</para>
</refsect1>
<refsect1 id="SQL-DROPTRIGGER-compatibility">
<title>Compatibility</title>
<para>
The <command>DROP TRIGGER</command> statement in
<productname>PostgreSQL</productname> is incompatible with the SQL
standard. In the SQL standard, trigger names are not local to
tables, so the command is simply <literal>DROP TRIGGER
<replaceable>name</replaceable></literal>.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createtrigger"></member>
</simplelist>
</refsect1>
</refentry>
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