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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_aggregate.sgml,v 1.23.2.1 2003/09/07 04:36:45 momjian Exp $
PostgreSQL documentation
-->
<refentry id="SQL-DROPAGGREGATE">
<refmeta>
<refentrytitle id="SQL-DROPAGGREGATE-TITLE">DROP AGGREGATE</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP AGGREGATE</refname>
<refpurpose>remove a user-defined aggregate function</refpurpose>
</refnamediv>
<indexterm zone="sql-dropaggregate">
<primary>DROP AGGREGATE</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
DROP AGGREGATE <replaceable class="PARAMETER">name</replaceable> ( <replaceable class="PARAMETER">type</replaceable> ) [ CASCADE | RESTRICT ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP AGGREGATE</command> will delete an existing
aggregate function. To execute this command the current
user must be the owner of the aggregate function.
</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 aggregate function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">type</replaceable></term>
<listitem>
<para>
The argument data type of the aggregate function, or
<literal>*</literal> if the function accepts any data type.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the aggregate function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESTRICT</literal></term>
<listitem>
<para>
Refuse to drop the aggregate 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 AGGREGATE</computeroutput></term>
<listitem>
<para>
Message returned if the command was successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: RemoveAggregate: aggregate '<replaceable class="parameter">name</replaceable>' for type <replaceable class="parameter">type</replaceable> does not exist</computeroutput></term>
<listitem>
<para>
This message is returned if the specified aggregate function
does not exist.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To remove the aggregate function <literal>myavg</literal> for type
<type>integer</type>:
<programlisting>
DROP AGGREGATE myavg(integer);
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is no <command>DROP AGGREGATE</command> statement in the SQL
standard.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-alteraggregate" endterm="sql-alteraggregate-title"></member>
<member><xref linkend="sql-createaggregate" endterm="sql-createaggregate-title"></member>
</simplelist>
</refsect1>
</refentry>
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