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1. |
Consider the relation X(P, Q, R, S, T, U) with the following set of functional dependencies F = { {P, R} → {S,T}, {P, S, U} → {Q, R} } Which of the following is the trivial functional dependency in F+ is closure of F |
A. | {P,R}→{S,T} |
B. | {P,R}→{R,T |
C. | {P,S}→{S} |
D. | {P,S,U}→{Q |
Answer» D. {P,S,U}→{Q | |