1<!--
2doc/src/sgml/ref/drop_collation.sgml
3PostgreSQL documentation
4-->
5
6<refentry id="sql-dropcollation">
7 <indexterm zone="sql-dropcollation">
8  <primary>DROP COLLATION</primary>
9 </indexterm>
10
11 <refmeta>
12  <refentrytitle>DROP COLLATION</refentrytitle>
13  <manvolnum>7</manvolnum>
14  <refmiscinfo>SQL - Language Statements</refmiscinfo>
15 </refmeta>
16
17 <refnamediv>
18  <refname>DROP COLLATION</refname>
19  <refpurpose>remove a collation</refpurpose>
20 </refnamediv>
21
22 <refsynopsisdiv>
23<synopsis>
24DROP COLLATION [ IF EXISTS ] <replaceable>name</replaceable> [ CASCADE | RESTRICT ]
25</synopsis>
26 </refsynopsisdiv>
27
28 <refsect1 id="sql-dropcollation-description">
29  <title>Description</title>
30
31  <para>
32   <command>DROP COLLATION</command> removes a previously defined collation.
33   To be able to drop a collation, you must own the collation.
34  </para>
35 </refsect1>
36
37 <refsect1>
38  <title>Parameters</title>
39
40   <variablelist>
41    <varlistentry>
42     <term><literal>IF EXISTS</literal></term>
43     <listitem>
44      <para>
45       Do not throw an error if the collation does not exist.
46       A notice is issued in this case.
47      </para>
48     </listitem>
49    </varlistentry>
50
51    <varlistentry>
52     <term><replaceable>name</replaceable></term>
53
54     <listitem>
55      <para>
56       The name of the collation. The collation name can be
57       schema-qualified.
58      </para>
59     </listitem>
60    </varlistentry>
61
62    <varlistentry>
63     <term><literal>CASCADE</literal></term>
64     <listitem>
65      <para>
66       Automatically drop objects that depend on the collation,
67       and in turn all objects that depend on those objects
68       (see <xref linkend="ddl-depend"/>).
69      </para>
70     </listitem>
71    </varlistentry>
72
73    <varlistentry>
74     <term><literal>RESTRICT</literal></term>
75     <listitem>
76      <para>
77       Refuse to drop the collation if any objects depend on it.  This
78       is the default.
79      </para>
80     </listitem>
81    </varlistentry>
82   </variablelist>
83 </refsect1>
84
85 <refsect1 id="sql-dropcollation-examples">
86  <title>Examples</title>
87
88  <para>
89   To drop the collation named <literal>german</literal>:
90<programlisting>
91DROP COLLATION german;
92</programlisting></para>
93 </refsect1>
94
95 <refsect1 id="sql-dropcollation-compat">
96  <title>Compatibility</title>
97
98  <para>
99   The <command>DROP COLLATION</command> command conforms to the
100   <acronym>SQL</acronym> standard, apart from the <literal>IF
101   EXISTS</literal> option, which is a <productname>PostgreSQL</productname> extension.
102  </para>
103 </refsect1>
104
105 <refsect1>
106  <title>See Also</title>
107
108  <simplelist type="inline">
109   <member><xref linkend="sql-altercollation"/></member>
110   <member><xref linkend="sql-createcollation"/></member>
111  </simplelist>
112 </refsect1>
113
114</refentry>
115