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<!--
doc/src/sgml/ref/alter_aggregate.sgml
PostgreSQL documentation
-->
<refentry id="sql-alteraggregate">
<indexterm zone="sql-alteraggregate">
<primary>ALTER AGGREGATE</primary>
</indexterm>
<refmeta>
<refentrytitle>ALTER AGGREGATE</refentrytitle>
<manvolnum>7</manvolnum>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER AGGREGATE</refname>
<refpurpose>change the definition of an aggregate function</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>aggregate_signature</replaceable> ) RENAME TO <replaceable>new_name</replaceable>
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>aggregate_signature</replaceable> )
OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>aggregate_signature</replaceable> ) SET SCHEMA <replaceable>new_schema</replaceable>
<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>ALTER AGGREGATE</command> changes the definition of an
aggregate function.
</para>
<para>
You must own the aggregate function to use <command>ALTER AGGREGATE</command>.
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 be able to <literal>SET ROLE</literal> to 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">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>ALTER 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><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>Notes</title>
<para>
The recommended syntax for referencing an ordered-set aggregate
is to write <literal>ORDER BY</literal> between the direct and aggregated
argument specifications, in the same style as in
<link linkend="sql-createaggregate"><command>CREATE AGGREGATE</command></link>. However, it will also work to
omit <literal>ORDER BY</literal> and just run the direct and aggregated
argument specifications into a single list. In this abbreviated form,
if <literal>VARIADIC "any"</literal> was used in both the direct and
aggregated argument lists, write <literal>VARIADIC "any"</literal> only once.
</para>
</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 ordered-set aggregate <literal>mypercentile</literal> with
direct argument of type <type>float8</type> and aggregated argument
of type <type>integer</type> into schema <literal>myschema</literal>:
<programlisting>
ALTER AGGREGATE mypercentile(float8 ORDER BY integer) SET SCHEMA myschema;
</programlisting>
This will work too:
<programlisting>
ALTER AGGREGATE mypercentile(float8, 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"/></member>
<member><xref linkend="sql-dropaggregate"/></member>
</simplelist>
</refsect1>
</refentry>
|
