____colour is the cover of the dictionary?
A.What
B.Which
C.How
D.Whose
答案:A
设有关系R(S,D,M),其函数依赖集F={S→D,D→M},则关系R的规范化程度至多达到
A.1NF
B.2NF
C.3NF
D.BCNF
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