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

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

时间:2023-01-26 10:49:39

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