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<refentry id="SQL-ALTERTRIGGER">
 <refmeta>
  <refentrytitle id="sql-altertrigger-title">
   ALTER TRIGGER
  </refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   ALTER TRIGGER
  </refname>
  <refpurpose>
   change the definition of a trigger
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>2002-04-19</date>
  </refsynopsisdivinfo>
  <synopsis>
ALTER TRIGGER <replaceable class="PARAMETER">trigger</replaceable> ON <replaceable class="PARAMETER">table</replaceable>
    RENAME TO <replaceable class="PARAMETER">newname</replaceable>
  </synopsis>

  <refsect2 id="R2-SQL-ALTERTRIGGER-1">
   <refsect2info>
    <date>2002-04-19</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <variablelist>

     <varlistentry>
      <term><replaceable class="PARAMETER"> trigger </replaceable></term>
      <listitem>
       <para>
	The name of an existing trigger to alter.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><replaceable class="PARAMETER"> table </replaceable></term>
      <listitem>
       <para>
	The name of the table on which this trigger acts.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><replaceable class="PARAMETER"> newname </replaceable></term>
      <listitem>
       <para>
	New name for the existing trigger.
       </para>
      </listitem>
     </varlistentry>

    </variablelist>
   </para>
  </refsect2>

  <refsect2 id="R2-SQL-ALTERTRIGGER-2">
   <refsect2info>
    <date>2002-04-19</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>

    <variablelist>
     <varlistentry>
      <term><computeroutput>ALTER</computeroutput></term>
      <listitem>
       <para>
	Message returned from trigger renaming.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><computeroutput>ERROR</computeroutput></term>
      <listitem>
       <para>
	Message returned if trigger is not available, or new name is a duplicate of another existing trigger on the table.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
 </refsynopsisdiv>

 <refsect1 id="R1-SQL-ALTERTRIGGER-1">
  <refsect1info>
   <date>2002-04-19</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <command>ALTER TRIGGER</command> changes the definition of an existing trigger.
   The <literal>RENAME</literal> clause causes the name of a trigger on the given table
   to change without otherwise changing the trigger definition.
  </para>

  <para>
   You must own the table on which the trigger acts in order to change its properties.
  </para>

  <refsect2 id="R2-SQL-ALTERTRIGGER-3">
   <refsect2info>
    <date>2002-04-19</date>
   </refsect2info>
   <title>
    Notes
   </title>
   <para>
    Refer to <command>CREATE TRIGGER</command> for a further description
    of valid arguments.
   </para>
  </refsect2>
 </refsect1>

 <refsect1 id="R1-SQL-ALTERTRIGGER-2">
  <title>
   Usage
  </title>
  <para>
   To rename an existing trigger:
   <programlisting>
ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
   </programlisting>
  </para>
 </refsect1>

 <refsect1 id="R1-SQL-ALTERTRIGGER-3">
  <title>
   Compatibility
  </title>

  <refsect2 id="R2-SQL-ALTERTRIGGER-4">
   <refsect2info>
    <date>2002-04-19</date>
   </refsect2info>
   <title>SQL92</title>
   <para>
    The clause to rename triggers is a
    <productname>PostgreSQL</productname> extension from SQL92.
   </para>
  </refsect2>
 </refsect1>
</refentry>

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