4 4 votes Consider the following relations: The number of records resulted by the following relational algebra expression are _________? Databases relational-algebra + – junaid ahmad 1.1k views answer comment Share Follow Print See all 7 Comments 7 7 Comments reply Show 4 previous comments Red_devil commented Dec 3, 2017 reply Follow flag T1-> Π(R-S) T2->Π(R-S) ((S*T1)-R) now R/S=T1-T2; as S=NuLL; as T2 will be null, T1 will be result... is it correct @joshi_nitish 0 0 replyShare Anmol Verma commented Dec 21, 2017 i edited by Anmol Verma Dec 21, 2017 reply Follow flag That means ans is table R1...right....?? i.e., all 4 tuples will be projected 0 0 replyShare hs_yadav commented Dec 21, 2017 reply Follow flag @ Anmol Verma yes actulaly R(AB)/(SB) means all rows form column A which are generated by all B...but hence B is having empty there for it will assume all are true and all the row from column A would be returned but here we r using relational algebra that is the reason all duplicate would be eliminated..... 2 2 replyShare Please log in or register to add a comment.
