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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
155 lines
3.7 KiB
Plaintext
155 lines
3.7 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 (such as views
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using it), 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 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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<para>
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Remove multiple operators in one command:
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<programlisting>
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DROP OPERATOR ~ (none, bit), ! (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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