A newer version of this documentation is available. Use the version menu above to view the most up-to-date release of the Greenplum 6.x documentation.
Removes an aggregate function.
DROP AGGREGATE [IF EXISTS] name ( aggregate_signature ) [CASCADE | RESTRICT]
where aggregate_signature is:
* | [ argmode ] [ argname ] argtype [ , ... ] | [ [ argmode ] [ argname ] argtype [ , ... ] ] ORDER BY [ argmode ] [ argname ] argtype [ , ... ]
DROP AGGREGATE will delete an existing aggregate function. To execute this command the current user must be the owner of the aggregate function.
- IF EXISTS
- Do not throw an error if the aggregate does not exist. A notice is issued in this case.
- The name (optionally schema-qualified) of an existing aggregate function.
- The mode of an argument: IN or VARIADIC. If omitted, the default is IN.
- The name of an argument. Note that DROP AGGREGATE does not actually pay any attention to argument names, since only the argument data types are needed to determine the aggregate function's identity.
- An input data type on which the aggregate function operates. To reference a zero-argument aggregate function, write * in place of the list of input data types. To reference an ordered-set aggregate function, write ORDER BY between the direct and aggregated argument specifications.
- Automatically drop objects that depend on the aggregate function.
- Refuse to drop the aggregate function if any objects depend on it. This is the default.
Alternative syntaxes for referencing ordered-set aggregates are described under ALTER AGGREGATE.
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");
There is no DROP AGGREGATE statement in the SQL standard.