【多选题】Consider a relation with schema R(A,B,C,D) and functional dependencies AB → C, D → A. Which of the following are followed from the given FD’s? (This is a multiple choice question)
【多选题】Consider a relation with schema R(A,B,C,D) and functional dependencies AB → C, D → A. Which of the following are superkeys of R? (This is a multiple choice question)