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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
150 lines
3.9 KiB
Plaintext
150 lines
3.9 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_opclass.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-dropopclass">
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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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<refmeta>
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<refentrytitle>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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<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</literal> 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 (such as
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indexes), and in turn all objects that depend on those objects
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(see <xref linkend="ddl-depend"/>).
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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</command> 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</command>). 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</command>; or perhaps
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better, use <command>DROP OPERATOR FAMILY</command> 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</literal> 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"/></member>
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<member><xref linkend="sql-createopclass"/></member>
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<member><xref linkend="sql-dropopfamily"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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