ALTER AGGREGATE
ALTER AGGREGATE
ALTER AGGREGATE - change the definition of an aggregate function
Synopsis
ALTER AGGREGATEname(aggregate_signature) RENAME TOnew_nameALTER AGGREGATEname(aggregate_signature) OWNER TO {new_owner| CURRENT_ROLE | CURRENT_USER | SESSION_USER } ALTER AGGREGATEname(aggregate_signature) SET SCHEMAnew_schemawhereaggregate_signatureis: * | [argmode] [argname]argtype[ , ... ] | [ [argmode] [argname]argtype[ , ... ] ] ORDER BY [argmode] [argname]argtype[ , ... ]
Description
ALTER AGGREGATE
changes the definition of an
aggregate function.
You must own the aggregate function to use
ALTER AGGREGATE
.
To change the schema of an aggregate function, you must also have
CREATE
privilege on the new schema.
To alter the owner, you must be able to
SET ROLE
to the
new owning role, and that role must have
CREATE
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.)
Parameters
-
name -
The name (optionally schema-qualified) of an existing aggregate function.
-
argmode -
The mode of an argument:
INorVARIADIC. If omitted, the default isIN. -
argname -
The name of an argument. Note that
ALTER AGGREGATEdoes not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function's identity. -
argtype -
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, writeORDER BYbetween the direct and aggregated argument specifications. -
new_name -
The new name of the aggregate function.
-
new_owner -
The new owner of the aggregate function.
-
new_schema -
The new schema for the aggregate function.
Notes
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
. 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.
Examples
To rename the aggregate function
myavg
for type
integer
to
my_average
:
ALTER AGGREGATE myavg(integer) RENAME TO my_average;
To change the owner of the aggregate function
myavg
for type
integer
to
joe
:
ALTER AGGREGATE myavg(integer) OWNER TO joe;
To move the ordered-set aggregate
mypercentile
with
direct argument of type
float8
and aggregated argument
of type
integer
into schema
myschema
:
ALTER AGGREGATE mypercentile(float8 ORDER BY integer) SET SCHEMA myschema;
This will work too:
ALTER AGGREGATE mypercentile(float8, integer) SET SCHEMA myschema;
Compatibility
There is no
ALTER AGGREGATE
statement in the SQL
standard.