Name
DB.DBA.BAG_OR_NULL_AGG — Returns a vector of passed values.
Synopsis
vector
DB.DBA.BAG_OR_NULL_AGG
(
|
value_expression
any
); |
Description
DB.DBA.BAG_OR_NULL_AGG
returns a vector of passed values.
Similar to DB.DBA.BAG_AGG()
but returns NULL instead of an empty vector
if no arguments were actually passed.
The order of items in the vector is not predefined and may vary from run to run.
Parameters
value_expression
Value of item for aggregation.
Return Types
Any. If no arguments were actually passed returns NULL instead of an empty vector.
Examples
Example 24.8. Simple Use
SELECT DB.DBA.BAG_OR_NULL_AGG (subquery.X) FROM (SELECT X FROM ... ORDER BY X) as subquery