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bb4eefe7bf
DocBook XML is superficially compatible with DocBook SGML but has a slightly stricter DTD that we have been violating in a few cases. Although XSLT doesn't care whether the document is valid, the style sheets don't necessarily process invalid documents correctly, so we need to work toward fixing this. This first commit moves the indexterms in refentry elements to an allowed position. It has no impact on the output.
148 lines
3.8 KiB
Plaintext
148 lines
3.8 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</> 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"></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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