A.(B, F, G, J, A, E, D, I, C, H)B.(B, A, D, E, F, G, I, J, H, C)C.(A, B, D, C, E, F, I
A.(B, F, G, J, A, E, D, I, C, H)
B.(B, A, D, E, F, G, I, J, H, C)
C.(A, B, D, C, E, F, I, J, G, H)
D.(A, B, D, C, F, E, J, I, H, G)
A.(B, F, G, J, A, E, D, I, C, H)
B.(B, A, D, E, F, G, I, J, H, C)
C.(A, B, D, C, E, F, I, J, G, H)
D.(A, B, D, C, F, E, J, I, H, G)
A.(C, B, D, A, F, E, I, J, G, H)
B.(C, B, D, A, E, F, I, G, J, H)
C.(B, A, D, E, F, G, I, J, H, C)
D.(B, C, D, A, E, F, I, J, G, H)
A.(A, B, D, C, F, E, I, J, H, G)
B.(A, B, D, C, E, F, I, H, G, J)
C.(B, F, G, E, A, I, D, C, H, J)
D.(B, F, G, J, A, E, D, I, C, H)
A.{A}{A,B,C,D,E}{A,B,C,D,E,P,G,H,I,J,K}
B.{F}{G}{H}{I}{J}{K}{B,F,G}{C,H}{D,I,J}{E,K}{A,B,C,D,E,F,G,H,I,J,K}
C.{K}{J}{I}{H}{G}{F}{B}{C}{D}{E}{A,B,C,D,E,F,G,H,I,J,K}
D.{A}{F}{G}{H}{I}{J}{K}{B,F,G}{C,H}{D,I,J}{E,K}{A,B,C,D,E,F,G,H,I,J,K}
A.(A, B, D, C, P, E, I, J, H, G)
B.(A, B, D, C, E, F, I, H, G, J)
C.(B, P, G, E, A, I, D, C, H, J)
D.(B, F, G, J, A, E, D, I, C, H)
A.(C, B, D, A, P, E, I, J, G, H)
B.(C, B, D, A, E, F, I, G, J, H)
C.(B, A, D, E, F, G, I, J, H, C)
D.(B, C, D, A, E, F, I, J, G, H)
A.(B, F, G, J, A, E, D, I, C, H)
B.(B, A, D, E, F, G, I, J, H, C)
C.(A, B, D, C, E, F, I, J, G, H)
D.(A, B, D, C, P, E, J, I, H, C)
A.{A}{A,B,C,D,E}{A,B,C,D,E,F,G,H,I,J,K}
B.{F}{G}{H}{I}{J}{K}{B,F,G}{C,H}{D,I,J}{E,K}{A,B,C,D,E,E,G,H,I,J,K}
C.{K}{J}{I}{H}{G}{F}{B}{C}{D}{E}{A,B,C,D,E,F,G,H,I,J,K}
D.{A}{F}{G}{H}{I}{J}{K}{B,F,G}{C,H}{D,I,J}{E,K}{A,B,C,D,E,F,G,H,I,J,K}
第52~54题基于以下叙述:
有关系模式P (A,B,C,D,E,F,G,H,1,J ),根据语义有如下函数依赖集:F
={ABD→E,AB→G,B→F,C→J,C→I,G→H}。
关系模式P的码是()。A.(A,C)B.(A,B,G)C.(A,G)D.(A,B,C,D)
基于以下描述:有关系模式P(A,B,c,D,E,F,c,H,I,J),根据语义有如下函数依赖集:F={ABD→E,AB→G;B→F,c→J,c→I,G→H}。
关系模式P的码为
A.(A,B,C,G)
B.(A,B,D,I)
C.(A,C,D,G)
D.(A,B,C,D)
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