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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>DROP CAST</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="sql-dropaggregate.html" title="DROP AGGREGATE" /><link rel="next" href="sql-dropcollation.html" title="DROP COLLATION" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">DROP CAST</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-dropaggregate.html" title="DROP AGGREGATE">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-dropcollation.html" title="DROP COLLATION">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-DROPCAST"><div class="titlepage"></div><a id="id-1.9.3.105.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">DROP CAST</span></h2><p>DROP CAST — remove a cast</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
DROP CAST [ IF EXISTS ] (<em class="replaceable"><code>source_type</code></em> AS <em class="replaceable"><code>target_type</code></em>) [ CASCADE | RESTRICT ]
</pre></div><div class="refsect1" id="SQL-DROPCAST-DESCRIPTION"><h2>Description</h2><p>
<code class="command">DROP CAST</code> removes a previously defined cast.
</p><p>
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.
</p></div><div class="refsect1" id="id-1.9.3.105.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">IF EXISTS</code></span></dt><dd><p>
Do not throw an error if the cast does not exist. A notice is issued
in this case.
</p></dd><dt><span class="term"><em class="replaceable"><code>source_type</code></em></span></dt><dd><p>
The name of the source data type of the cast.
</p></dd><dt><span class="term"><em class="replaceable"><code>target_type</code></em></span></dt><dd><p>
The name of the target data type of the cast.
</p></dd><dt><span class="term"><code class="literal">CASCADE</code><br /></span><span class="term"><code class="literal">RESTRICT</code></span></dt><dd><p>
These key words do not have any effect, since there are no
dependencies on casts.
</p></dd></dl></div></div><div class="refsect1" id="SQL-DROPCAST-EXAMPLES"><h2>Examples</h2><p>
To drop the cast from type <code class="type">text</code> to type <code class="type">int</code>:
</p><pre class="programlisting">
DROP CAST (text AS int);
</pre></div><div class="refsect1" id="SQL-DROPCAST-COMPAT"><h2>Compatibility</h2><p>
The <code class="command">DROP CAST</code> command conforms to the SQL standard.
</p></div><div class="refsect1" id="id-1.9.3.105.9"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createcast.html" title="CREATE CAST"><span class="refentrytitle">CREATE CAST</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-dropaggregate.html" title="DROP AGGREGATE">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-dropcollation.html" title="DROP COLLATION">Next</a></td></tr><tr><td width="40%" align="left" valign="top">DROP AGGREGATE </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="40%" align="right" valign="top"> DROP COLLATION</td></tr></table></div></body></html>
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