<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_operator.sgml,v 1.10 2001/05/08 17:51:30 momjian Exp $
-Postgres documentation
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_operator.sgml,v 1.22 2003/09/22 00:16:58 petere Exp $
+PostgreSQL documentation
-->
<refentry id="SQL-DROPOPERATOR">
<refmeta>
- <refentrytitle id="SQL-DROPOPERATOR-TITLE">
- DROP OPERATOR
- </refentrytitle>
+ <refentrytitle id="SQL-DROPOPERATOR-TITLE">DROP OPERATOR</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
+
<refnamediv>
- <refname>
- DROP OPERATOR
- </refname>
- <refpurpose>
- Removes an operator from the database
- </refpurpose>
+ <refname>DROP OPERATOR</refname>
+ <refpurpose>remove an operator</refpurpose>
</refnamediv>
+ <indexterm zone="sql-dropoperator">
+ <primary>DROP OPERATOR</primary>
+ </indexterm>
+
<refsynopsisdiv>
- <refsynopsisdivinfo>
- <date>1999-07-20</date>
- </refsynopsisdivinfo>
- <synopsis>
-DROP OPERATOR <replaceable class="PARAMETER">id</replaceable> ( <replaceable class="PARAMETER">lefttype</replaceable> | NONE , <replaceable class="PARAMETER">righttype</replaceable> | NONE )
- </synopsis>
-
- <refsect2 id="R2-SQL-DROPOPERATOR-1">
- <refsect2info>
- <date>1998-09-22</date>
- </refsect2info>
- <title>
- Inputs
- </title>
- <para>
- <variablelist>
- <varlistentry>
- <term><replaceable class="parameter">id</replaceable></term>
- <listitem>
- <para>
- The identifier of an existing operator.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><replaceable class="parameter">lefttype</replaceable></term>
- <listitem>
- <para>
- The type of the operator's left argument; write <literal>NONE</literal> if the
- operator has no left argument.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><replaceable class="parameter">righttype</replaceable></term>
- <listitem>
- <para>
- The type of the operator's right argument; write <literal>NONE</literal> if the
- operator has no right argument.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
- </refsect2>
-
- <refsect2 id="R2-SQL-DROPOPERATOR-2">
- <refsect2info>
- <date>1998-09-22</date>
- </refsect2info>
- <title>
- Outputs
- </title>
- <para>
-
- <variablelist>
- <varlistentry>
- <term><computeroutput>
-DROP
- </computeroutput></term>
- <listitem>
- <para>
- The message returned if the command is successful.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><computeroutput>
-ERROR: RemoveOperator: binary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' and '<replaceable class="PARAMETER">righttype</replaceable>' does not exist
- </computeroutput></term>
- <listitem>
- <para>
- This message occurs if the specified binary operator does not exist.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><computeroutput>
-ERROR: RemoveOperator: left unary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">lefttype</replaceable>' does not exist
- </computeroutput></term>
- <listitem>
- <para>
- This message occurs if the left unary operator
- specified does not exist.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><computeroutput>
-ERROR: RemoveOperator: right unary operator '<replaceable class="PARAMETER">oper</replaceable>' taking '<replaceable class="PARAMETER">righttype</replaceable>' does not exist
- </computeroutput></term>
- <listitem>
- <para>
- This message occurs if the right unary operator
- specified does not exist.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
- </refsect2>
+<synopsis>
+DROP OPERATOR <replaceable class="PARAMETER">name</replaceable> ( <replaceable class="PARAMETER">lefttype</replaceable> | NONE , <replaceable class="PARAMETER">righttype</replaceable> | NONE ) [ CASCADE | RESTRICT ]
+</synopsis>
</refsynopsisdiv>
- <refsect1 id="R1-SQL-DROPOPERATOR-1">
- <refsect1info>
- <date>1998-09-22</date>
- </refsect1info>
- <title>
- Description
- </title>
- <para>
- <command>DROP OPERATOR</command> drops an existing operator from the
- database.
- To execute this command you must be the owner of the operator.
- </para>
+ <refsect1>
+ <title>Description</title>
+
<para>
- The left or right type of a left or right unary
- operator, respectively, must be specified as <literal>NONE</literal>.
+ <command>DROP OPERATOR</command> drops an existing operator from
+ the database system. To execute this command you must be the owner
+ of the operator.
</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Parameters</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><replaceable class="parameter">name</replaceable></term>
+ <listitem>
+ <para>
+ The name (optionally schema-qualified) of an existing operator.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><replaceable class="parameter">lefttype</replaceable></term>
+ <listitem>
+ <para>
+ The data type of the operator's left operand; write
+ <literal>NONE</literal> if the operator has no left operand.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><replaceable class="parameter">righttype</replaceable></term>
+ <listitem>
+ <para>
+ The data type of the operator's right operand; write
+ <literal>NONE</literal> if the operator has no right operand.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>CASCADE</literal></term>
+ <listitem>
+ <para>
+ Automatically drop objects that depend on the operator.
+ </para>
+ </listitem>
+ </varlistentry>
- <refsect2 id="R2-SQL-DROPOPERATOR-3">
- <refsect2info>
- <date>1998-09-22</date>
- </refsect2info>
- <title>
- Notes
- </title>
- <para>
- The <command>DROP OPERATOR</command> statement is a
- <productname>Postgres</productname>
- language extension.
- </para>
- <para>
- Refer to
- <xref linkend="sql-createoperator" endterm="sql-createoperator-title">
- for information on how to create operators.
- </para>
- <para>
- It is the user's responsibility to remove any access methods and
- operator classes that rely on the deleted operator.
- </para>
- </refsect2>
+ <varlistentry>
+ <term><literal>RESTRICT</literal></term>
+ <listitem>
+ <para>
+ Refuse to drop the operator if any objects depend on it. This
+ is the default.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
</refsect1>
- <refsect1 id="R1-SQL-DROPOPERATOR-2">
- <title>
- Usage
- </title>
- <para>
- Remove power operator <literal>a^n</literal> for <literal>int4</literal>:
+ <refsect1>
+ <title>Examples</title>
- <programlisting>
-DROP OPERATOR ^ (int4, int4);
- </programlisting>
+ <para>
+ Remove the power operator <literal>a^b</literal> for type <type>integer</type>:
+<programlisting>
+DROP OPERATOR ^ (integer, integer);
+</programlisting>
</para>
+
<para>
- Remove left unary negation operator (<literal>! b</literal>) for booleans:
- <programlisting>
-DROP OPERATOR ! (none, bool);
- </programlisting>
+ Remove the left unary bitwise complement operator
+ <literal>~b</literal> for type <type>bit</type>:
+<programlisting>
+DROP OPERATOR ~ (none, bit);
+</programlisting>
</para>
+
<para>
- Remove right unary factorial operator (<literal>i !</literal>) for
- <literal>int4</literal>:
-DROP OPERATOR ! (int4, none);
- </programlisting>
+ Remove the right unary factorial operator <literal>x!</literal>
+ for type <type>integer</type>:
+<programlisting>
+DROP OPERATOR ! (integer, none);
+</programlisting>
</para>
</refsect1>
- <refsect1 id="R1-SQL-DROPOPERATOR-3">
- <title>
- Compatibility
- </title>
-
- <refsect2 id="R2-SQL-DROPOPERATOR-4">
- <refsect2info>
- <date>1998-09-22</date>
- </refsect2info>
- <title>
- SQL92
- </title>
- <para>
- There is no <command>DROP OPERATOR</command> in <acronym>SQL92</acronym>.
- </para>
- </refsect2>
+ <refsect1>
+ <title>Compatibility</title>
+
+ <para>
+ There is no <command>DROP OPERATOR</command> statement in the SQL standard.
+ </para>
</refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+
+ <simplelist type="inline">
+ <member><xref linkend="sql-createoperator" endterm="sql-createoperator-title"></member>
+ </simplelist>
+ </refsect1>
+
</refentry>
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