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<!--
doc/src/sgml/ref/drop_aggregate.sgml
PostgreSQL documentation
-->
<refentry id="sql-dropaggregate">
<indexterm zone="sql-dropaggregate">
<primary>DROP AGGREGATE</primary>
</indexterm>
<refmeta>
<refentrytitle>DROP AGGREGATE</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DROP AGGREGATE</refname>
<refpurpose>remove an aggregate function</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
DROP AGGREGATE [ IF EXISTS ] <replaceable>name</replaceable> ( <replaceable>aggregate_signature</replaceable> ) [, ...] [ CASCADE | RESTRICT ]
<phrase>where <replaceable>aggregate_signature</replaceable> is:</phrase>
* |
[ <replaceable>argmode</replaceable> ] [ <replaceable>argname</replaceable> ] <replaceable>argtype</replaceable> [ , ... ] |
[ [ <replaceable>argmode</replaceable> ] [ <replaceable>argname</replaceable> ] <replaceable>argtype</replaceable> [ , ... ] ] ORDER BY [ <replaceable>argmode</replaceable> ] [ <replaceable>argname</replaceable> ] <replaceable>argtype</replaceable> [ , ... ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>DROP AGGREGATE</command> removes 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><literal>IF EXISTS</literal></term>
<listitem>
<para>
Do not throw an error if the aggregate does not exist. A notice is issued
in this case.
</para>
</listitem>
</varlistentry>
<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">argmode</replaceable></term>
<listitem>
<para>
The mode of an argument: <literal>IN</literal> or <literal>VARIADIC</literal>.
If omitted, the default is <literal>IN</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">argname</replaceable></term>
<listitem>
<para>
The name of an argument.
Note that <command>DROP AGGREGATE</command> does not actually pay
any attention to argument names, since only the argument data
types are needed to determine the aggregate function's identity.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">argtype</replaceable></term>
<listitem>
<para>
An input data type on which the aggregate function operates.
To reference a zero-argument aggregate function, write <literal>*</literal>
in place of the list of argument specifications.
To reference an ordered-set aggregate function, write
<literal>ORDER BY</literal> between the direct and aggregated argument
specifications.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CASCADE</literal></term>
<listitem>
<para>
Automatically drop objects that depend on the aggregate function
(such as views using it),
and in turn all objects that depend on those objects
(see <xref linkend="ddl-depend"/>).
</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>Notes</title>
<para>
Alternative syntaxes for referencing ordered-set aggregates
are described under <xref linkend="sql-alteraggregate"/>.
</para>
</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>
<para>
To remove the hypothetical-set aggregate function <literal>myrank</literal>,
which takes an arbitrary list of ordering columns and a matching list
of direct arguments:
<programlisting>
DROP AGGREGATE myrank(VARIADIC "any" ORDER BY VARIADIC "any");
</programlisting>
</para>
<para>
To remove multiple aggregate functions in one command:
<programlisting>
DROP AGGREGATE myavg(integer), myavg(bigint);
</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"/></member>
<member><xref linkend="sql-createaggregate"/></member>
</simplelist>
</refsect1>
</refentry>
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