Let R = ABCDE is a relational scheme with functional dependency set F = {A -> B, B ->C,AC -> D}. The attribute closures of A and E are
A. ABCD, Ø
B. ABCD, E
C. ɸ , Ø
D. ABC, E
Answer:A
Let R = ABCDE is a relational scheme with functional dependency set F = {A -> B, B ->C,AC -> D}. The attribute closures of A and E are
A. ABCD, Ø B. ABCD, E C. ɸ , Ø D. ABC, E