Well it’s obvious that the answer is (C).
But can anyone verify my analysis of other Options?
Option (A) : Prints values which are in column A of R1,but not in Column A of R2.
Option (B) : It will print ‘x’ every time it is in column A of R1 and in atleast one time in column A of R2. Oh wait ,bcoz it is a Set ,’x’ will be printed only once!
Option (D) : Prints values if which are in column A
of both relations R1 & R2