Hi,
Sorry I am not aware of the SAP BW InfoCube compression concept.
But my use case is -
Considering the same tables as in the start of this discussion,
Table U has multiple records.
What I need to be done is - If the value in U.COL exists in table T (T.COL) then update the U.VAL in T.VAL. If the value U.COL does not exist in T.COL then Insert the U.COL and U.VAL in T.COL and T.VAL.
As for your question - Table U does not have a primary key as such.. But in my situation U.COL will not have duplicate records. So a record in T will match (if present) only for one record in U.
Hope this makes sense.
Thanks,
Varun Vemala