0 0 votes Databases tuple-relational-calculus + – joshi_nitish 998 views answer comment Share Follow Print See all 2 Comments 2 2 Comments reply joshi_nitish commented Jun 20, 2017 reply Follow flag which of the above queries are equivalent?? 0 0 replyShare Arnab Bhadra commented Jun 20, 2017 reply Follow flag What is the question? 0 0 replyShare Please log in or register to add a comment.