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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_trigger.sgml,v 1.13.2.1 2002/11/21 23:31:58 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPTRIGGER">
<refmeta>
<refentrytitle id="SQL-DROPTRIGGER-TITLE">DROP TRIGGER</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
DROP TRIGGER
</refname>
<refpurpose>
remove a trigger
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1998-09-22</date>
</refsynopsisdivinfo>
<synopsis>
DROP TRIGGER <replaceable class="PARAMETER">name</replaceable> ON <replaceable class="PARAMETER">table</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
<refsect2 id="R2-SQL-DROPTRIGGER-1">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of an existing trigger.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="PARAMETER">table</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of a table.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CASCADE</term>
<listitem>
<para>
Automatically drop objects that depend on the trigger.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>RESTRICT</term>
<listitem>
<para>
Refuse to drop the trigger if there are any dependent objects.
This is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-DROPTRIGGER-2">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
DROP TRIGGER
</computeroutput></term>
<listitem>
<para>
The message returned if the trigger is successfully dropped.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: DropTrigger: there is no trigger <replaceable class="PARAMETER">name</replaceable> on relation "<replaceable class="parameter">table</replaceable>"
</computeroutput></term>
<listitem>
<para>
This message occurs if the trigger specified does not exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-DROPTRIGGER-1">
<refsect1info>
<date>1998-09-22</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>DROP TRIGGER</command> will remove 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 id="SQL-DROPTRIGGER-examples">
<title>Examples</title>
<para>
Destroy the <literal>if_dist_exists</literal> trigger
on table <literal>films</literal>:
<programlisting>
DROP TRIGGER if_dist_exists ON films;
</programlisting>
</para>
</refsect1>
<refsect1 id="SQL-DROPTRIGGER-compatibility">
<title>Compatibility</title>
<variablelist>
<varlistentry>
<term>SQL92</term>
<listitem>
<para>
There is no <command>DROP TRIGGER</command> statement in
<acronym>SQL92</acronym>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>SQL99</term>
<listitem>
<para>
The <command>DROP TRIGGER</command> statement in
<productname>PostgreSQL</productname> is incompatible with
SQL99. In SQL99, trigger names are not local to tables, so the
command is simply <literal>DROP TRIGGER
<replaceable>name</replaceable></literal>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createtrigger" endterm="sql-createtrigger-title"></member>
</simplelist>
</refsect1>
</refentry>
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