drop_domain.sgml

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/drop_domain.sgml,v 1.15 2005/05/02 01:52:50 neilc Exp $
PostgreSQL documentation
-->

<refentry id="SQL-DROPDOMAIN">
 <refmeta>
  <refentrytitle id="SQL-DROPDOMAIN-TITLE">DROP DOMAIN</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP DOMAIN</refname>
  <refpurpose>remove a domain</refpurpose>
 </refnamediv>

 <indexterm zone="sql-dropdomain">
  <primary>DROP DOMAIN</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
DROP DOMAIN <replaceable class="PARAMETER">name</replaceable> [, ...]  [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>DROP DOMAIN</command> will remove a domain.  Only the
   owner of a domain can remove it.
  </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 domain.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CASCADE</></term>
    <listitem>
     <para>
      Automatically drop objects that depend on the domain (such as
      table columns).
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>RESTRICT</></term>
    <listitem>
     <para>
      Refuse to drop the domain if any objects depend on it.  This is
      the default.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 id="SQL-DROPDOMAIN-examples">
  <title>Examples</title>

  <para>
   To remove the domain <type>box</type>:

<programlisting>
DROP DOMAIN box;
</programlisting>
  </para>
 </refsect1>

 <refsect1 id="SQL-DROPDOMAIN-compatibility">
  <title>Compatibility</title>
  
  <para>
   This command conforms to the SQL standard.
  </para>
 </refsect1>

 <refsect1 id="SQL-DROPDOMAIN-see-also">
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-createdomain" endterm="sql-createdomain-title"></member>
   <member><xref linkend="sql-alterdomain" endterm="sql-alterdomain-title"></member>
  </simplelist>
 </refsect1>

</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:"/usr/lib/sgml/catalog"
sgml-local-ecat-files:nil
End:
-->