'\" t
.\"     Title: ALTER AGGREGATE
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2021
.\"    Manual: PostgreSQL 13.4 Documentation
.\"    Source: PostgreSQL 13.4
.\"  Language: English
.\"
.TH "ALTER AGGREGATE" "7" "2021" "PostgreSQL 13.4" "PostgreSQL 13.4 Documentation"
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.SH "NAME"
ALTER_AGGREGATE \- change the definition of an aggregate function
.SH "SYNOPSIS"
.sp
.nf
ALTER AGGREGATE \fIname\fR ( \fIaggregate_signature\fR ) RENAME TO \fInew_name\fR
ALTER AGGREGATE \fIname\fR ( \fIaggregate_signature\fR )
                OWNER TO { \fInew_owner\fR | CURRENT_USER | SESSION_USER }
ALTER AGGREGATE \fIname\fR ( \fIaggregate_signature\fR ) SET SCHEMA \fInew_schema\fR

where \fIaggregate_signature\fR is:

* |
[ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] |
[ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] ] ORDER BY [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ]
.fi
.SH "DESCRIPTION"
.PP
\fBALTER AGGREGATE\fR
changes the definition of an aggregate function\&.
.PP
You must own the aggregate function to use
\fBALTER AGGREGATE\fR\&. To change the schema of an aggregate function, you must also have
CREATE
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
CREATE
privilege on the aggregate function\*(Aqs schema\&. (These restrictions enforce that altering the owner doesn\*(Aqt do anything you couldn\*(Aqt do by dropping and recreating the aggregate function\&. However, a superuser can alter ownership of any aggregate function anyway\&.)
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name (optionally schema\-qualified) of an existing aggregate function\&.
.RE
.PP
\fIargmode\fR
.RS 4
The mode of an argument:
IN
or
VARIADIC\&. If omitted, the default is
IN\&.
.RE
.PP
\fIargname\fR
.RS 4
The name of an argument\&. Note that
\fBALTER AGGREGATE\fR
does not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function\*(Aqs identity\&.
.RE
.PP
\fIargtype\fR
.RS 4
An input data type on which the aggregate function operates\&. To reference a zero\-argument aggregate function, write
*
in place of the list of argument specifications\&. To reference an ordered\-set aggregate function, write
ORDER BY
between the direct and aggregated argument specifications\&.
.RE
.PP
\fInew_name\fR
.RS 4
The new name of the aggregate function\&.
.RE
.PP
\fInew_owner\fR
.RS 4
The new owner of the aggregate function\&.
.RE
.PP
\fInew_schema\fR
.RS 4
The new schema for the aggregate function\&.
.RE
.SH "NOTES"
.PP
The recommended syntax for referencing an ordered\-set aggregate is to write
ORDER BY
between the direct and aggregated argument specifications, in the same style as in
CREATE AGGREGATE (\fBCREATE_AGGREGATE\fR(7))\&. However, it will also work to omit
ORDER BY
and just run the direct and aggregated argument specifications into a single list\&. In this abbreviated form, if
VARIADIC "any"
was used in both the direct and aggregated argument lists, write
VARIADIC "any"
only once\&.
.SH "EXAMPLES"
.PP
To rename the aggregate function
myavg
for type
integer
to
my_average:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER AGGREGATE myavg(integer) RENAME TO my_average;
.fi
.if n \{\
.RE
.\}
.PP
To change the owner of the aggregate function
myavg
for type
integer
to
joe:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER AGGREGATE myavg(integer) OWNER TO joe;
.fi
.if n \{\
.RE
.\}
.PP
To move the ordered\-set aggregate
mypercentile
with direct argument of type
float8
and aggregated argument of type
integer
into schema
myschema:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER AGGREGATE mypercentile(float8 ORDER BY integer) SET SCHEMA myschema;
.fi
.if n \{\
.RE
.\}
.sp
This will work too:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER AGGREGATE mypercentile(float8, integer) SET SCHEMA myschema;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
There is no
\fBALTER AGGREGATE\fR
statement in the SQL standard\&.
.SH "SEE ALSO"
CREATE AGGREGATE (\fBCREATE_AGGREGATE\fR(7)), DROP AGGREGATE (\fBDROP_AGGREGATE\fR(7))