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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_opclass.sgml,v 1.2 2002/09/21 18:32:54 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPOPCLASS">
<refmeta>
<refentrytitle id="SQL-DROPOPCLASS-TITLE">DROP OPERATOR CLASS</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
DROP OPERATOR CLASS
</refname>
<refpurpose>
remove a user-defined operator class
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>2002-07-28</date>
</refsynopsisdivinfo>
<synopsis>
DROP OPERATOR CLASS <replaceable class="PARAMETER">name</replaceable> USING <replaceable class="PARAMETER">access_method</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
<refsect2 id="R2-SQL-DROPOPCLASS-1">
<refsect2info>
<date>2002-07-28</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing operator class.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">access_method</replaceable></term>
<listitem>
<para>
The name of the index access method the operator class is for.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CASCADE</term>
<listitem>
<para>
Automatically drop objects that depend on the operator class.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>RESTRICT</term>
<listitem>
<para>
Refuse to drop the operator class if there are any dependent objects.
This is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-DROPOPCLASS-2">
<refsect2info>
<date>2002-07-28</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
DROP OPERATOR CLASS
</computeroutput></term>
<listitem>
<para>
The message returned if the command is successful.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-DROPOPCLASS-1">
<refsect1info>
<date>2002-07-28</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>DROP OPERATOR CLASS</command> drops an existing operator class
from the database.
To execute this command you must be the owner of the operator class.
</para>
<refsect2 id="R2-SQL-DROPOPCLASS-3">
<refsect2info>
<date>2002-07-28</date>
</refsect2info>
<title>
Notes
</title>
<para>
The <command>DROP OPERATOR CLASS</command> statement is a
<productname>PostgreSQL</productname>
language extension.
</para>
<para>
Refer to
<xref linkend="sql-createopclass" endterm="sql-createopclass-title">
for information on how to create operator classes.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-DROPOPCLASS-2">
<title>
Usage
</title>
<para>
Remove B-tree operator class <literal>widget_ops</literal>:
<programlisting>
DROP OPERATOR CLASS widget_ops USING btree;
</programlisting>
This command will not execute if there are any existing indexes
that use the operator class. Add <literal>CASCADE</> to drop
such indexes along with the operator class.
</para>
</refsect1>
<refsect1 id="R1-SQL-DROPOPCLASS-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-DROPOPCLASS-4">
<refsect2info>
<date>2002-07-28</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>DROP OPERATOR CLASS</command> in
<acronym>SQL92</acronym>.
</para>
</refsect2>
</refsect1>
</refentry>
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