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<!--
doc/src/sgml/ref/drop_collation.sgml
PostgreSQL documentation
-->
<refentry id="sql-dropcollation">
<indexterm zone="sql-dropcollation">
<primary>DROP COLLATION</primary>
</indexterm>
<refmeta>
<refentrytitle>DROP COLLATION</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP COLLATION</refname>
<refpurpose>remove a collation</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP COLLATION [ IF EXISTS ] <replaceable>name</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1 id="sql-dropcollation-description">
<title>Description</title>
<para>
<command>DROP COLLATION</command> removes a previously defined collation.
To be able to drop a collation, you must own the collation.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>IF EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if the collation does not exist.
A notice is issued in this case.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>name</replaceable></term>
<listitem>
<para>
The name of the collation. The collation name can be
schema-qualified.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the collation,
and in turn all objects that depend on those objects
(see <xref linkend="ddl-depend"/>).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the collation if any objects depend on it. This
is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="sql-dropcollation-examples">
<title>Examples</title>
<para>
To drop the collation named <literal>german</literal>:
<programlisting>
DROP COLLATION german;
</programlisting></para>
</refsect1>
<refsect1 id="sql-dropcollation-compat">
<title>Compatibility</title>
<para>
The <command>DROP COLLATION</command> command conforms to the
<acronym>SQL</acronym> standard, apart from the <literal>IF
EXISTS</literal> option, which is a <productname>PostgreSQL</productname> extension.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-altercollation"/></member>
<member><xref linkend="sql-createcollation"/></member>
</simplelist>
</refsect1>
</refentry>
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