drop_conversion.sgml

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

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

 <refnamediv>
  <refname>DROP CONVERSION</refname>
  <refpurpose>remove a conversion</refpurpose>
 </refnamediv>

 <indexterm zone="sql-dropconversion">
  <primary>DROP CONVERSION</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
DROP CONVERSION <replaceable>name</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>
  
 <refsect1 id="sql-dropconversion-description">
  <title>Description</title>

  <para>
   <command>DROP CONVERSION</command> removes a previously defined conversion.
   To be able to drop a conversion, you must own the conversion.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

   <variablelist>
    <varlistentry>
     <term><replaceable>name</replaceable></term>

     <listitem>
      <para>
       The name of the conversion. The conversion name may be
       schema-qualified.
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><literal>CASCADE</literal></term>
     <term><literal>RESTRICT</literal></term>

     <listitem>
      <para>
       These key words do not have any effect, since there are no
       dependencies on conversions.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
 </refsect1>

 <refsect1 id="sql-dropconversion-examples">
  <title>Examples</title>

  <para>
   To drop the conversion named <literal>myname</>:
<programlisting>
DROP CONVERSION myname;
</programlisting>
  </para>
 </refsect1>

 <refsect1 id="sql-dropconversion-compat">
  <title>Compatibility</title>

  <para>
   There is no <command>DROP CONVERSION</command> statement in the SQL
   standard.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

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

</refentry>

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