0 votes 0 votes i got Q2 is correct?? but answer is given Q1 plz check ??????? Databases test-series + – Hradesh patel asked Jan 27, 2017 Hradesh patel 196 views answer comment Share Follow See 1 comment See all 1 1 comment reply akashsheoran commented Jan 28, 2017 reply Follow Share Your answer is correct. Q1 will give null as output because of 'equal to' comparison. Since every S1 will match itself for sure, 'not exist' will return false for every S1 giving null as result. 1 votes 1 votes Please log in or register to add a comment.