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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.
147 lines
3.5 KiB
Plaintext
147 lines
3.5 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_operator.sgml
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PostgreSQL documentation
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-->
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<refentry id="SQL-DROPOPERATOR">
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<indexterm zone="sql-dropoperator">
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<primary>DROP OPERATOR</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP OPERATOR</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</refname>
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<refpurpose>remove an operator</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP OPERATOR [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> ( { <replaceable class="PARAMETER">left_type</replaceable> | NONE } , { <replaceable class="PARAMETER">right_type</replaceable> | NONE } ) [ 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</command> drops an existing operator from
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the database system. To execute this command you must be the owner
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of the operator.
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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 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.
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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">left_type</replaceable></term>
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<listitem>
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<para>
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The data type of the operator's left operand; write
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<literal>NONE</literal> if the operator has no left operand.
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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">right_type</replaceable></term>
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<listitem>
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<para>
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The data type of the operator's right operand; write
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<literal>NONE</literal> if the operator has no right operand.
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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.
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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 if any objects depend on it. This
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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>Examples</title>
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<para>
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Remove the power operator <literal>a^b</literal> for type <type>integer</type>:
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<programlisting>
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DROP OPERATOR ^ (integer, integer);
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</programlisting>
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</para>
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<para>
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Remove the left unary bitwise complement operator
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<literal>~b</literal> for type <type>bit</type>:
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<programlisting>
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DROP OPERATOR ~ (none, bit);
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</programlisting>
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</para>
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<para>
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Remove the right unary factorial operator <literal>x!</literal>
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for type <type>bigint</type>:
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<programlisting>
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DROP OPERATOR ! (bigint, none);
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</programlisting></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</command> statement in the 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-createoperator"></member>
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<member><xref linkend="sql-alteroperator"></member>
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</simplelist>
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</refsect1>
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</refentry>
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