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148 lines
3.9 KiB
Plaintext
148 lines
3.9 KiB
Plaintext
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$PostgreSQL: pgsql/doc/src/sgml/ref/drop_opclass.sgml,v 1.13 2008/11/14 10:22:46 petere Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-DROPOPCLASS">
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<refmeta>
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<refentrytitle id="SQL-DROPOPCLASS-TITLE">DROP OPERATOR CLASS</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DROP OPERATOR CLASS</refname>
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<refpurpose>remove an operator class</refpurpose>
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</refnamediv>
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<indexterm zone="sql-dropopclass">
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<primary>DROP OPERATOR CLASS</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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DROP OPERATOR CLASS [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> USING <replaceable class="PARAMETER">index_method</replaceable> [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>DROP OPERATOR CLASS</command> drops an existing operator class.
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To execute this command you must be the owner of the operator class.
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</para>
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<para>
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<command>DROP OPERATOR CLASS</command> does not drop any of the operators
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or functions referenced by the class. If there are any indexes depending
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on the operator class, you will need to specify
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<literal>CASCADE</> for the drop to complete.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the operator class does not exist. A notice is issued
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in this case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an existing operator class.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">index_method</replaceable></term>
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<listitem>
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<para>
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The name of the index access method the operator class is for.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>CASCADE</literal></term>
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<listitem>
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<para>
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Automatically drop objects that depend on the operator class.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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Refuse to drop the operator class if any objects depend on it.
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This is the default.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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<command>DROP OPERATOR CLASS</> will not drop the operator family
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containing the class, even if there is nothing else left in the
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family (in particular, in the case where the family was implicitly
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created by <command>CREATE OPERATOR CLASS</>). An empty operator
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family is harmless, but for the sake of tidiness you might wish to
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remove the family with <command>DROP OPERATOR FAMILY</>; or perhaps
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better, use <command>DROP OPERATOR FAMILY</> in the first place.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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Remove the B-tree operator class <literal>widget_ops</literal>:
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<programlisting>
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DROP OPERATOR CLASS widget_ops USING btree;
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</programlisting>
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This command will not succeed if there are any existing indexes
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that use the operator class. Add <literal>CASCADE</> to drop
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such indexes along with the operator class.
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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There is no <command>DROP OPERATOR CLASS</command> statement in the
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SQL standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-alteropclass" endterm="sql-alteropclass-title"></member>
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<member><xref linkend="sql-createopclass" endterm="sql-createopclass-title"></member>
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<member><xref linkend="sql-dropopfamily" endterm="sql-dropopfamily-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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