mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-06 04:09:20 +02:00
121 lines
2.7 KiB
Plaintext
121 lines
2.7 KiB
Plaintext
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_cast.sgml,v 1.5 2003/09/22 00:16:58 petere Exp $ -->
|
|
|
|
<refentry id="SQL-DROPCAST">
|
|
<refmeta>
|
|
<refentrytitle id="SQL-DROPCAST-TITLE">DROP CAST</refentrytitle>
|
|
<refmiscinfo>SQL - Language Statements</refmiscinfo>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>DROP CAST</refname>
|
|
<refpurpose>remove a cast</refpurpose>
|
|
</refnamediv>
|
|
|
|
<indexterm zone="sql-dropcast">
|
|
<primary>DROP CAST</primary>
|
|
</indexterm>
|
|
|
|
<refsynopsisdiv>
|
|
<synopsis>
|
|
DROP CAST (<replaceable>sourcetype</replaceable> AS <replaceable>targettype</replaceable>) [ CASCADE | RESTRICT ]
|
|
</synopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1 id="sql-dropcast-description">
|
|
<title>Description</title>
|
|
|
|
<para>
|
|
<command>DROP CAST</command> removes a previously defined cast.
|
|
</para>
|
|
|
|
<para>
|
|
To be able to drop a cast, you must own the source or the target
|
|
data type. These are the same privileges that are required to
|
|
create a cast.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Parameters</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><replaceable>sourcetype</replaceable></term>
|
|
|
|
<listitem>
|
|
<para>
|
|
The name of the source data type of the cast.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><replaceable>targettype</replaceable></term>
|
|
|
|
<listitem>
|
|
<para>
|
|
The name of the target data type of the cast.
|
|
</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 casts.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1 id="sql-dropcast-examples">
|
|
<title>Examples</title>
|
|
|
|
<para>
|
|
To drop the cast from type <type>text</type> to type <type>int</type>:
|
|
<programlisting>
|
|
DROP CAST (text AS int);
|
|
</programlisting>
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1 id="sql-dropcast-compat">
|
|
<title>Compatibility</title>
|
|
|
|
<para>
|
|
The <command>DROP CAST</command> command conforms to the SQL standard.
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
|
|
<simplelist type="inline">
|
|
<member><xref linkend="sql-createcast" endterm="sql-createcast-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:
|
|
-->
|