问题
单项选择题
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
答案
参考答案：D
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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
参考答案：D