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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/drop_aggregate.sgml,v 1.19 2002/07/12 18:43:12 tgl 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>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
DROP AGGREGATE <replaceable class="PARAMETER">name</replaceable> ( <replaceable class="PARAMETER">type</replaceable> ) [ CASCADE | RESTRICT ]
</synopsis>
<refsect2 id="R2-SQL-DROPAGGREGATE-1">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<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 input data type of the aggregate function,
or <literal>*</literal> if the function accepts any input type.
(Refer to the <citetitle>PostgreSQL User's Guide</citetitle> for
further information about data types.)
<comment>This should become a cross-reference rather than a
hard-coded chapter number</comment>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>CASCADE</term>
<listitem>
<para>
Automatically drop objects that depend on the aggregate.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>RESTRICT</term>
<listitem>
<para>
Refuse to drop the aggregate if there are any dependent objects.
This is the default.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-DROPAGGREGATE-2">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
DROP AGGREGATE
</computeroutput></term>
<listitem>
<para>
Message returned if the command is 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 occurs if the aggregate function specified does not
exist in the database.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-DROPAGGREGATE-1">
<refsect1info>
<date>1998-04-15</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>DROP AGGREGATE</command> will delete an existing
aggregate definition. To execute this command the current
user must be the owner of the aggregate.
</para>
<refsect2 id="R2-SQL-DROPAGGREGATE-3">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
Notes
</title>
<para>
Use
<xref linkend="sql-createaggregate" endterm="sql-createaggregate-title">
to create aggregate functions.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-DROPAGGREGATE-2">
<title>
Usage
</title>
<para>
To remove the <literal>myavg</literal> aggregate for type
<literal>int4</literal>:
</para>
<programlisting>
DROP AGGREGATE myavg(int4);
</programlisting>
</refsect1>
<refsect1 id="R1-SQL-DROPAGGREGATE-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-DROPAGGREGATE-4">
<refsect2info>
<date>1998-04-15</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>DROP AGGREGATE</command> statement
in <acronym>SQL92</acronym>; the statement is a
<productname>PostgreSQL</productname>
language extension.
</para>
</refsect2>
</refsect1>
</refentry>
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