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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_operator.sgml,v 1.19 2003/05/04 02:23:16 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPOPERATOR">
<refmeta>
<refentrytitle id="SQL-DROPOPERATOR-TITLE">DROP OPERATOR</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP OPERATOR</refname>
<refpurpose>remove a user-defined operator</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP OPERATOR <replaceable class="PARAMETER">name</replaceable> ( <replaceable class="PARAMETER">lefttype</replaceable> | NONE , <replaceable class="PARAMETER">righttype</replaceable> | NONE ) [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP OPERATOR</command> drops an existing operator from
the database system. To execute this command you must be the owner
of the operator.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing operator.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">lefttype</replaceable></term>
<listitem>
<para>
The data type of the operator's left operand; write
<literal>NONE</literal> if the operator has no left operand.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">righttype</replaceable></term>
<listitem>
<para>
The data type of the operator's right operand; write
<literal>NONE</literal> if the operator has no right operand.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the operator.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the operator if any objects depend on it. This
is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<variablelist>
<varlistentry>
<term><computeroutput>DROP OPERATOR</computeroutput></term>
<listitem>
<para>
Message returned if the command was successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: RemoveOperator: binary operator '<replaceable class="PARAMETER">name</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' and '<replaceable class="PARAMETER">righttype</replaceable>' does not exist</computeroutput></term>
<listitem>
<para>
This message is returned if the specified binary operator does not exist.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: RemoveOperator: left unary operator '<replaceable class="PARAMETER">name</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' does not exist</computeroutput></term>
<listitem>
<para>
This message is returned if the specified left unary operator
does not exist.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: RemoveOperator: right unary operator '<replaceable class="PARAMETER">name</replaceable>' taking '<replaceable class="PARAMETER">righttype</replaceable>' does not exist</computeroutput></term>
<listitem>
<para>
This message is returned if the specified right unary operator
does not exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Remove the power operator <literal>a^b</literal> for type <type>integer</type>:
<programlisting>
DROP OPERATOR ^ (integer, integer);
</programlisting>
</para>
<para>
Remove the left unary bitwise complement operator
<literal>~b</literal> for type <type>bit</type>:
<programlisting>
DROP OPERATOR ~ (none, bit);
</programlisting>
</para>
<para>
Remove the right unary factorial operator <literal>x!</literal>
for type <type>integer</type>:
<programlisting>
DROP OPERATOR ! (integer, none);
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is no <command>DROP OPERATOR</command> statement in the SQL standard.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createoperator" endterm="sql-createoperator-title"></member>
</simplelist>
</refsect1>
</refentry>
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