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Suppose we have the relation schema R(A,B,C,D)with functional dependencies;F{A→B

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

正确答案:

D

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