Suppose we have the relation schema R(A,B,
题型:单项选择题
问题:
Suppose we have the relation schema R(A,B,C,D) with functional dependencies ;F{A→ B,B→C,C→D,D→A},then R(A,B,C,D) at least is in
A.1NF
B.2NF
C.3NF
D.BCNF
Suppose we have the relation schema R(A,B,C,D) with functional dependencies ;F{A→ B,B→C,C→D,D→A},then R(A,B,C,D) at least is in
A.1NF
B.2NF
C.3NF
D.BCNF