doc/src/sgml/ref/drop_conversion.sgml

   1 <!--
   2 doc/src/sgml/ref/drop_conversion.sgml
   3 PostgreSQL documentation
   4 -->
   5
   6 <refentry id="sql-dropconversion">
   7  <indexterm zone="sql-dropconversion">
   8   <primary>DROP CONVERSION</primary>
   9  </indexterm>
  10
  11  <refmeta>
  12   <refentrytitle>DROP CONVERSION</refentrytitle>
  13   <manvolnum>7</manvolnum>
  14   <refmiscinfo>SQL - Language Statements</refmiscinfo>
  15  </refmeta>
  16
  17  <refnamediv>
  18   <refname>DROP CONVERSION</refname>
  19   <refpurpose>remove a conversion</refpurpose>
  20  </refnamediv>
  21
  22  <refsynopsisdiv>
  23 <synopsis>
  24 DROP CONVERSION [ IF EXISTS ] <replaceable>name</replaceable> [ CASCADE | RESTRICT ]
  25 </synopsis>
  26  </refsynopsisdiv>
  27
  28  <refsect1 id="sql-dropconversion-description">
  29   <title>Description</title>
  30
  31   <para>
  32    <command>DROP CONVERSION</command> removes a previously defined conversion.
  33    To be able to drop a conversion, you must own the conversion.
  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 conversion does not exist.
  46        A notice is issued in this case.
  47       </para>
  48      </listitem>
  49     </varlistentry>
  50
  51     <varlistentry>
  52      <term><replaceable>name</replaceable></term>
  53
  54      <listitem>
  55       <para>
  56        The name of the conversion. The conversion name can be
  57        schema-qualified.
  58       </para>
  59      </listitem>
  60     </varlistentry>
  61
  62     <varlistentry>
  63      <term><literal>CASCADE</literal></term>
  64      <term><literal>RESTRICT</literal></term>
  65
  66      <listitem>
  67       <para>
  68        These key words do not have any effect, since there are no
  69        dependencies on conversions.
  70       </para>
  71      </listitem>
  72     </varlistentry>
  73    </variablelist>
  74  </refsect1>
  75
  76  <refsect1 id="sql-dropconversion-examples">
  77   <title>Examples</title>
  78
  79   <para>
  80    To drop the conversion named <literal>myname</literal>:
  81 <programlisting>
  82 DROP CONVERSION myname;
  83 </programlisting></para>
  84  </refsect1>
  85
  86  <refsect1 id="sql-dropconversion-compat">
  87   <title>Compatibility</title>
  88
  89   <para>
  90    There is no <command>DROP CONVERSION</command> statement in the SQL
  91    standard, but a <command>DROP TRANSLATION</command> statement that
  92    goes along with the <command>CREATE TRANSLATION</command> statement
  93    that is similar to the <command>CREATE CONVERSION</command>
  94    statement in PostgreSQL.
  95   </para>
  96  </refsect1>
  97
  98  <refsect1>
  99   <title>See Also</title>
 100
 101   <simplelist type="inline">
 102    <member><xref linkend="sql-alterconversion"/></member>
 103    <member><xref linkend="sql-createconversion"/></member>
 104   </simplelist>
 105  </refsect1>
 106
 107 </refentry>