postgresql/doc/src/sgml/ref/drop_trigger.sgml

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PostgreSQL documentation
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<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"></member>
  </simplelist>
 </refsect1>
</refentry>

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