115 lines
2.5 KiB
Plaintext
115 lines
2.5 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_domain.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-dropdomain">
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<indexterm zone="sql-dropdomain">
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<primary>DROP DOMAIN</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP DOMAIN</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DROP DOMAIN</refname>
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<refpurpose>remove a domain</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP DOMAIN [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [, ...] [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>DROP DOMAIN</command> removes a domain. Only the owner of
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a domain can remove it.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the domain does not exist. A notice is issued
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in this case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an existing domain.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>CASCADE</literal></term>
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<listitem>
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<para>
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Automatically drop objects that depend on the domain (such as
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table columns),
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and in turn all objects that depend on those objects
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(see <xref linkend="ddl-depend"/>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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Refuse to drop the domain if any objects depend on it. This is
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the default.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="sql-dropdomain-examples">
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<title>Examples</title>
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<para>
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To remove the domain <type>box</type>:
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<programlisting>
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DROP DOMAIN box;
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</programlisting></para>
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</refsect1>
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<refsect1 id="sql-dropdomain-compatibility">
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<title>Compatibility</title>
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<para>
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This command conforms to the SQL standard, except for the
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<literal>IF EXISTS</literal> option, which is a <productname>PostgreSQL</productname>
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extension.
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</para>
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</refsect1>
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<refsect1 id="sql-dropdomain-see-also">
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createdomain"/></member>
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<member><xref linkend="sql-alterdomain"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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