题目内容
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[主观题]
Suppose we have the relation schema R(A, B, C, D)with functional dependencies; F{A→B,B→C,
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(73).
A.1NF
B.2NF
C.3NF
D.BCNFThe construct eobegin Statement1; Statement2; coend means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the p
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