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【简答题】
有关系模式R(S,T,C,D,G),根据语义有如下函数依赖集:F={(S,C) →T,C →D,(S,C) →G,T→C}。关系模式R的候选码( )。 A)只有1个,为(S,C) B)只有1个,为(S,T) C)有2个,为(S,C)和(S,T) D)有2个,为(S,C)和(T)
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