1 votes 1 votes Correct Ans and how? Databases made-easy-test-series databases sql + – Jason_Roy asked Jan 21, 2017 edited Mar 6, 2019 by adeebafatima1 Jason_Roy 395 views answer comment Share Follow See 1 comment See all 1 1 comment reply Vijay Solanky commented Jan 21, 2017 reply Follow Share You can check it here https://gateoverflow.in/107675/made-easy 0 votes 0 votes Please log in or register to add a comment.
1 votes 1 votes The inner Query returns the number of rows that satisfy the condition. In this case it is zero. It can never be a empty set. As it can not be a empty set, Exists {non empty set} is always true. So all the records in R is selected. Answer is a. 3 Arnab Bhadra answered Jun 12, 2017 Arnab Bhadra comment Share Follow See all 0 reply Please log in or register to add a comment.