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<!--
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>
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>
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