Hi Vinay,
it will be better if you join the two table and pull the data from them rather than using sql statement.
According to the above sql statement for each and every record it hits the DB so BODS will not have any burden on it and DB server will handle. But it takes time if your data volume is high.
So I suggest you to use JOINS rather than SQL statement push-down.
Thanks,
Jagadeesh Borra