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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_operator.sgml,v 1.18 2002/07/29 22:14:10 tgl 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>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
DROP OPERATOR <replaceable class="PARAMETER">id</replaceable> ( <replaceable class="PARAMETER">lefttype</replaceable> | NONE , <replaceable class="PARAMETER">righttype</replaceable> | NONE ) [ CASCADE | RESTRICT ]
</synopsis>
<refsect2 id="R2-SQL-DROPOPERATOR-1">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">id</replaceable></term>
<listitem>
<para>
The identifier (optionally schema-qualified) of an existing operator.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">lefttype</replaceable></term>
<listitem>
<para>
The type of the operator's left argument; write <literal>NONE</literal> if the
operator has no left argument.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">righttype</replaceable></term>
<listitem>
<para>
The type of the operator's right argument; write <literal>NONE</literal> if the
operator has no right argument.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CASCADE</term>
<listitem>
<para>
Automatically drop objects that depend on the operator.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>RESTRICT</term>
<listitem>
<para>
Refuse to drop the operator if there are any dependent objects.
This is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-DROPOPERATOR-2">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
DROP OPERATOR
</computeroutput></term>
<listitem>
<para>
The message returned if the command is successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: RemoveOperator: binary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' and '<replaceable class="PARAMETER">righttype</replaceable>' does not exist
</computeroutput></term>
<listitem>
<para>
This message occurs if the specified binary operator does not exist.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: RemoveOperator: left unary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' does not exist
</computeroutput></term>
<listitem>
<para>
This message occurs if the left unary operator
specified does not exist.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
ERROR: RemoveOperator: right unary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">righttype</replaceable>' does not exist
</computeroutput></term>
<listitem>
<para>
This message occurs if the right unary operator
specified does not exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-DROPOPERATOR-1">
<refsect1info>
<date>1998-09-22</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>DROP OPERATOR</command> drops an existing operator from the
database.
To execute this command you must be the owner of the operator.
</para>
<para>
The left or right type of a left or right unary
operator, respectively, must be specified as <literal>NONE</literal>.
</para>
<refsect2 id="R2-SQL-DROPOPERATOR-3">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
Notes
</title>
<para>
The <command>DROP OPERATOR</command> statement is a
<productname>PostgreSQL</productname>
language extension.
</para>
<para>
Refer to
<xref linkend="sql-createoperator" endterm="sql-createoperator-title">
for information on how to create operators.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-DROPOPERATOR-2">
<title>
Usage
</title>
<para>
Remove power operator <literal>a^n</literal> for <literal>int4</literal>:
<programlisting>
DROP OPERATOR ^ (int4, int4);
</programlisting>
</para>
<para>
Remove left unary negation operator (<literal>! b</literal>) for <type>boolean</type>:
<programlisting>
DROP OPERATOR ! (none, bool);
</programlisting>
</para>
<para>
Remove right unary factorial operator (<literal>i !</literal>) for
<literal>int4</literal>:
<programlisting>
DROP OPERATOR ! (int4, none);
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-DROPOPERATOR-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-DROPOPERATOR-4">
<refsect2info>
<date>1998-09-22</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>DROP OPERATOR</command> in <acronym>SQL92</acronym>.
</para>
</refsect2>
</refsect1>
</refentry>
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