1<!--
2doc/src/sgml/ref/drop_domain.sgml
3PostgreSQL documentation
4-->
5
6<refentry id="sql-dropdomain">
7 <indexterm zone="sql-dropdomain">
8  <primary>DROP DOMAIN</primary>
9 </indexterm>
10
11 <refmeta>
12  <refentrytitle>DROP DOMAIN</refentrytitle>
13  <manvolnum>7</manvolnum>
14  <refmiscinfo>SQL - Language Statements</refmiscinfo>
15 </refmeta>
16
17 <refnamediv>
18  <refname>DROP DOMAIN</refname>
19  <refpurpose>remove a domain</refpurpose>
20 </refnamediv>
21
22 <refsynopsisdiv>
23<synopsis>
24DROP DOMAIN [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [, ...] [ CASCADE | RESTRICT ]
25</synopsis>
26 </refsynopsisdiv>
27
28 <refsect1>
29  <title>Description</title>
30
31  <para>
32   <command>DROP DOMAIN</command> removes a domain.  Only the owner of
33   a domain can remove it.
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 domain does not exist. A notice is issued
46      in this case.
47     </para>
48    </listitem>
49   </varlistentry>
50
51   <varlistentry>
52    <term><replaceable class="parameter">name</replaceable></term>
53    <listitem>
54     <para>
55      The name (optionally schema-qualified) of an existing domain.
56     </para>
57    </listitem>
58   </varlistentry>
59
60   <varlistentry>
61    <term><literal>CASCADE</literal></term>
62    <listitem>
63     <para>
64      Automatically drop objects that depend on the domain (such as
65      table columns),
66      and in turn all objects that depend on those objects
67      (see <xref linkend="ddl-depend"/>).
68     </para>
69    </listitem>
70   </varlistentry>
71
72   <varlistentry>
73    <term><literal>RESTRICT</literal></term>
74    <listitem>
75     <para>
76      Refuse to drop the domain if any objects depend on it.  This is
77      the default.
78     </para>
79    </listitem>
80   </varlistentry>
81  </variablelist>
82 </refsect1>
83
84 <refsect1 id="sql-dropdomain-examples">
85  <title>Examples</title>
86
87  <para>
88   To remove the domain <type>box</type>:
89
90<programlisting>
91DROP DOMAIN box;
92</programlisting></para>
93 </refsect1>
94
95 <refsect1 id="sql-dropdomain-compatibility">
96  <title>Compatibility</title>
97
98  <para>
99   This command conforms to the SQL standard, except for the
100   <literal>IF EXISTS</literal> option, which is a <productname>PostgreSQL</productname>
101   extension.
102  </para>
103 </refsect1>
104
105 <refsect1 id="sql-dropdomain-see-also">
106  <title>See Also</title>
107
108  <simplelist type="inline">
109   <member><xref linkend="sql-createdomain"/></member>
110   <member><xref linkend="sql-alterdomain"/></member>
111  </simplelist>
112 </refsect1>
113
114</refentry>
115