Consider a relation with schema R(A, B, CD) and FD's BC-> D, D-> A, A-> B. Which of the following is the key of R?
[A]
BD
[B]
D
[C]
AB
[D]
BC
Answer: D
Consider a relation with schema R(A, B, CD) and FD's BC-> D, D-> A, A-> B. Which of the following is the key of R?
[A]
BD
[B]
D
[C]
AB
[D]
BC
Answer: D