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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_function.sgml,v 1.25 2003/06/27 14:45:26 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPFUNCTION">
<refmeta>
<refentrytitle id="SQL-DROPFUNCTION-TITLE">DROP FUNCTION</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP FUNCTION</refname>
<refpurpose>remove a user-defined function</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceable class="parameter">type</replaceable> [, ...] ] ) [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP FUNCTION</command> removes the definition of an existing
function. To execute this command the user must be the
owner of the function. The argument types to the
function must be specified, since several different functions
may exist with the same name and different argument lists.
</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 function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">type</replaceable></term>
<listitem>
<para>
The data type of an argument of the function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the function (such as
operators or triggers).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the function if any objects depend on it. This
is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<variablelist>
<varlistentry>
<term><computeroutput>DROP FUNCTION</computeroutput></term>
<listitem>
<para>
Message returned if the command completes successfully.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>WARNING: RemoveFunction: Function <replaceable class="parameter">name</replaceable> (<replaceable class="parameter">types</replaceable>) does not exist</computeroutput></term>
<listitem>
<para>
This message is output if the function specified does not exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="SQL-DROPFUNCTION-examples">
<title>Examples</title>
<para>
This command removes the square root function:
<programlisting>
DROP FUNCTION sqrt(integer);
</programlisting>
</para>
</refsect1>
<refsect1 id="SQL-DROPFUNCTION-compatibility">
<title>Compatibility</title>
<para>
A <command>DROP FUNCTION</command> statement is defined in the SQL
standard, but it is not compatible with this command.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createfunction" endterm="sql-createfunction-title"></member>
<member><xref linkend="sql-alterfunction" endterm="sql-alterfunction-title"></member>
</simplelist>
</refsect1>
</refentry>
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