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

<refentry id="SQL-ALTERCOLLATION">
 <indexterm zone="sql-altercollation">
  <primary>ALTER COLLATION</primary>
 </indexterm>

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

 <refnamediv>
  <refname>ALTER COLLATION</refname>
  <refpurpose>change the definition of a collation</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER COLLATION <replaceable>name</replaceable> RENAME TO <replaceable>new_name</replaceable>
ALTER COLLATION <replaceable>name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
ALTER COLLATION <replaceable>name</replaceable> SET SCHEMA <replaceable>new_schema</replaceable>
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER COLLATION</command> changes the definition of a
   collation.
  </para>

  <para>
   You must own the collation to use <command>ALTER COLLATION</>.
   To alter the owner, you must also be a direct or indirect member of the new
   owning role, and that role must have <literal>CREATE</literal> privilege on
   the collation's schema.  (These restrictions enforce that altering the
   owner doesn't do anything you couldn't do by dropping and recreating the
   collation. However, a superuser can alter ownership of any collation
   anyway.)
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name (optionally schema-qualified) of an existing collation.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_name</replaceable></term>
    <listitem>
     <para>
      The new name of the collation.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_owner</replaceable></term>
    <listitem>
     <para>
      The new owner of the collation.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_schema</replaceable></term>
    <listitem>
     <para>
      The new schema for the collation.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename the collation <literal>de_DE</literal> to
   <literal>german</literal>:
<programlisting>
ALTER COLLATION "de_DE" RENAME TO german;
</programlisting>
  </para>

  <para>
   To change the owner of the collation <literal>en_US</literal> to
   <literal>joe</literal>:
<programlisting>
ALTER COLLATION "en_US" OWNER TO joe;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   There is no <command>ALTER COLLATION</command> statement in the SQL
   standard.
  </para>
 </refsect1>

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

  <simplelist type="inline">
   <member><xref linkend="sql-createcollation"></member>
   <member><xref linkend="sql-dropcollation"></member>
  </simplelist>
 </refsect1>
</refentry>
