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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_aggregate.sgml,v 1.7 2005/10/13 22:44:51 tgl Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ALTERAGGREGATE">
<refmeta>
<refentrytitle id="SQL-ALTERAGGREGATE-TITLE">ALTER AGGREGATE</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER AGGREGATE</refname>
<refpurpose>change the definition of an aggregate function</refpurpose>
</refnamediv>
<indexterm zone="sql-alteraggregate">
<primary>ALTER AGGREGATE</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> ) RENAME TO <replaceable>new_name</replaceable>
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> ) OWNER TO <replaceable>new_owner</replaceable>
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> ) SET SCHEMA <replaceable>new_schema</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER AGGREGATE</command> changes the definition of an
aggregate function.
</para>
<para>
You must own the aggregate function to use <command>ALTER AGGREGATE</>.
To change the schema of an aggregate function, you must also have
<literal>CREATE</literal> privilege on the new schema.
To alter the owner, you must also be a direct or indirect member of the new
owning role, and that role must have <literal>CREATE</literal> privilege on
the aggregate function's schema. (These restrictions enforce that altering
the owner doesn't do anything you couldn't do by dropping and recreating
the aggregate function. However, a superuser can alter ownership of any
aggregate function anyway.)
</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><replaceable class="parameter">new_name</replaceable></term>
<listitem>
<para>
The new name of the aggregate function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">new_owner</replaceable></term>
<listitem>
<para>
The new owner of the aggregate function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">new_schema</replaceable></term>
<listitem>
<para>
The new schema for the aggregate function.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To rename the aggregate function <literal>myavg</literal> for type
<type>integer</type> to <literal>my_average</literal>:
<programlisting>
ALTER AGGREGATE myavg(integer) RENAME TO my_average;
</programlisting>
</para>
<para>
To change the owner of the aggregate function <literal>myavg</literal> for type
<type>integer</type> to <literal>joe</literal>:
<programlisting>
ALTER AGGREGATE myavg(integer) OWNER TO joe;
</programlisting>
</para>
<para>
To move the aggregate function <literal>myavg</literal> for type
<type>integer</type> into schema <literal>myschema</literal>:
<programlisting>
ALTER AGGREGATE myavg(integer) SET SCHEMA myschema;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is no <command>ALTER AGGREGATE</command> statement in the SQL
standard.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createaggregate" endterm="sql-createaggregate-title"></member>
<member><xref linkend="sql-dropaggregate" endterm="sql-dropaggregate-title"></member>
</simplelist>
</refsect1>
</refentry>
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