<!--
doc/src/sgml/ref/alter_rule.sgml
PostgreSQL documentation
-->

<refentry id="SQL-ALTERRULE">
 <indexterm zone="sql-alterrule">
  <primary>ALTER RULE</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>ALTER RULE</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER RULE</refname>
  <refpurpose>change the definition of a rule</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER RULE <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER RULE</command> changes properties of an existing
   rule.  Currently, the only available action is to change the rule's name.
  </para>

  <para>
   To use <command>ALTER RULE</command>, you must own the table or view that
   the rule applies to.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name of an existing rule to alter.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">table_name</replaceable></term>
    <listitem>
     <para>
      The name (optionally schema-qualified) of the table or view that the
      rule applies to.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_name</replaceable></term>
    <listitem>
     <para>
      The new name for the rule.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename an existing rule:
<programlisting>
ALTER RULE notify_all ON emp RENAME TO notify_me;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   <command>ALTER RULE</command> is a
   <productname>PostgreSQL</productname> language extension, as is the
   entire query rewrite system.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-createrule"></member>
   <member><xref linkend="sql-droprule"></member>
  </simplelist>
 </refsect1>

</refentry>
