select distinct over specific columns
- by Midhat
A query in a system I maintain returns
QID AID DATA
1 2 x
1 2 y
5 6 t
As per a new requirement, I do not want the (QID, AID)=(1,2) pair to be repeated. We also dont care what value is selected from "data" column. either x or y will do.
What I have done is to enclose the original query like this
SELECT * FROM (<original query text>) Results group by QID,AID
Is there a better way to go about this? The original query uses multiple joins and unions and what not, So I would prefer not to touch it unless its absolutely necesary