If am not clear already !

---> The first way seems promising as i have the requirement of only the first hash keys remain as it is, where as the 2nd way shown here will put the 2nd hash sets unique keys also into the 1st hash.

I wanted something like the first way, because i would want the first hash keys remain as it is... I don't want the second hash's unique keys to be added to the 1st hash. But the result i want is like the 1st way i shown, but not as with the same kind of looping implementation.