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1st chunk of `doc/src/sgml/ref/drop_opclass.sgml`
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<!--
doc/src/sgml/ref/drop_opclass.sgml
PostgreSQL documentation
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<refentry id="sql-dropopclass">
 <indexterm zone="sql-dropopclass">
  <primary>DROP OPERATOR CLASS</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>DROP OPERATOR CLASS</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP OPERATOR CLASS</refname>
  <refpurpose>remove an operator class</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
DROP OPERATOR CLASS [ IF EXISTS ] <replaceable class="parameter">name</replaceable> USING <replaceable class="parameter">index_method</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>DROP OPERATOR CLASS</command> drops an existing operator class.
   To execute this command you must be the owner of the operator class.
  </para>

  <para>
   <command>DROP OPERATOR CLASS</command> does not drop any of the operators
   or functions referenced by the class.  If there are any indexes depending
   on the operator class, you will need to specify
   <literal>CASCADE</literal> for the drop to complete.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>

   <varlistentry>
    <term><literal>IF EXISTS</literal></term>
    <listitem>
     <para>
      Do not throw an error if the operator class does not exist. A notice is issued
      in this case.
     </para>
    </listitem>
   </varlistentry>

   <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">index_method</replaceable></term>
    <listitem>
     <para>
      The name of the index access method the operator class is for.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>

Title: DROP OPERATOR CLASS
Summary
The DROP OPERATOR CLASS command removes an existing operator class. You must be the owner of the operator class to execute this command. The command does not drop any of the operators or functions referenced by the class. If there are any indexes depending on the operator class, you will need to specify CASCADE for the drop to complete. The IF EXISTS option prevents an error from being thrown if the operator class does not exist. The name parameter specifies the name of the operator class to drop, and the index_method parameter specifies the name of the index access method the operator class is for.