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148 lines
3.6 KiB
Plaintext
148 lines
3.6 KiB
Plaintext
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$PostgreSQL: pgsql/doc/src/sgml/ref/drop_operator.sgml,v 1.28 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-DROPOPERATOR">
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<refmeta>
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<refentrytitle id="SQL-DROPOPERATOR-TITLE">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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<indexterm zone="sql-dropoperator">
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<primary>DROP OPERATOR</primary>
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</indexterm>
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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">lefttype</replaceable> | NONE } , { <replaceable class="PARAMETER">righttype</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">lefttype</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">righttype</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>
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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</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" endterm="sql-createoperator-title"></member>
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<member><xref linkend="sql-alteroperator" endterm="sql-alteroperator-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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