doc/src/sgml/ref/drop_language.sgml - master - githubmirror/postgres

doc/src/sgml/ref/drop_language.sgml
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Peter Eisentraut
Improve <xref> vs. <command> formatting in the documentation
03 окт 2020, 17:40
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<!--
doc/src/sgml/ref/drop_language.sgml
PostgreSQL documentation
-->

<refentry id="sql-droplanguage">
 <indexterm zone="sql-droplanguage">
  <primary>DROP LANGUAGE</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>DROP LANGUAGE</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP LANGUAGE</refname>
  <refpurpose>remove a procedural language</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
DROP [ PROCEDURAL ] LANGUAGE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>DROP LANGUAGE</command> removes the definition of a
   previously registered procedural language.  You must be a superuser
   or the owner of the language to use <command>DROP LANGUAGE</command>.
  </para>

  <note>
   <para>
    As of <productname>PostgreSQL</productname> 9.1, most procedural
    languages have been made into <quote>extensions</quote>, and should
    therefore be removed with <link linkend="sql-dropextension"><command>DROP EXTENSION</command></link>
    not <command>DROP LANGUAGE</command>.
   </para>
  </note>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>

   <varlistentry>
    <term><literal>IF EXISTS</literal></term>
    <listitem>
     <para>
      Do not throw an error if the language does not exist. A notice is issued
      in this case.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name of an existing procedural language.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CASCADE</literal></term>
    <listitem>
     <para>
      Automatically drop objects that depend on the language (such as
      functions in the language),
      and in turn all objects that depend on those objects
      (see <xref linkend="ddl-depend"/>).
     </para>
    </listitem>
   </varlistentry>

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

 <refsect1>
  <title>Examples</title>

  <para>
   This command removes the procedural language
   <literal>plsample</literal>:

<programlisting>
DROP LANGUAGE plsample;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

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

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

  <simplelist type="inline">
   <member><xref linkend="sql-alterlanguage"/></member>
   <member><xref linkend="sql-createlanguage"/></member>
  </simplelist>
 </refsect1>

</refentry>