DROP AGGREGATE
DROP AGGREGATE
DROP AGGREGATE - remove an aggregate function
Synopsis
DROP AGGREGATE [ IF EXISTS ]name(aggregate_signature) [, ...] [ CASCADE | RESTRICT ] whereaggregate_signatureis: * | [argmode] [argname]argtype[ , ... ] | [ [argmode] [argname]argtype[ , ... ] ] ORDER BY [argmode] [argname]argtype[ , ... ]
Description
DROP AGGREGATE
removes an existing
aggregate function. To execute this command the current
user must be the owner of the aggregate function.
Parameters
-
IF EXISTS -
Do not throw an error if the aggregate does not exist. A notice is issued in this case.
-
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
DROP 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. -
CASCADE -
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 Section 5.13 ).
-
RESTRICT -
Refuse to drop the aggregate function if any objects depend on it. This is the default.
Notes
Alternative syntaxes for referencing ordered-set aggregates are described under ALTER AGGREGATE .
Examples
To remove the aggregate function
myavg
for type
integer
:
DROP AGGREGATE myavg(integer);
To remove the hypothetical-set aggregate function
myrank
,
which takes an arbitrary list of ordering columns and a matching list
of direct arguments:
DROP AGGREGATE myrank(VARIADIC "any" ORDER BY VARIADIC "any");
To remove multiple aggregate functions in one command:
DROP AGGREGATE myavg(integer), myavg(bigint);
Compatibility
There is no
DROP AGGREGATE
statement in the SQL
standard.