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PostgreSQL documentation
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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>

 <indexterm zone="sql-altertrigger">
  <primary>ALTER TRIGGER</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
ALTER TRIGGER <replaceable class="PARAMETER">trigger</replaceable> ON <replaceable class="PARAMETER">table</replaceable>
    RENAME TO <replaceable class="PARAMETER">newname</replaceable>
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER TRIGGER</command> changes properties of an existing
   trigger.  The <literal>RENAME</literal> clause changes the name of
   the given trigger without otherwise changing the trigger
   definition.
  </para>

  <para>
   You must own the table on which the trigger acts to be allowed to change its properties.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameter</title>

  <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>
      The new name for the trigger.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Diagnostics</title>

  <variablelist>
   <varlistentry>
    <term><computeroutput>ALTER TRIGGER</computeroutput></term>
    <listitem>
     <para>
      Message returned if successful.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><computeroutput>ERROR</computeroutput></term>
    <listitem>
     <para>
      If the trigger does not exist, or the new name is a duplicate of
      another existing trigger on the table.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename an existing trigger:
<programlisting>
ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
</programlisting>
  </para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   <command>ALTER TRIGGER</command> is a <productname>PostgreSQL</>
   extension of the SQL standard.
  </para>
 </refsect1>
</refentry>

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