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Question 1 (4 marks] Consider a relation R=(A, B, C, D, E, F) that satisfies the following four FDs: {ABC, BCAD, D+E, CFB} Does AB
Question 1 (4 marks] Consider a relation R=(A, B, C, D, E, F) that satisfies the following four FDs: {ABC, BCAD, D+E, CFB} Does AB = F hold? If so, show a formal proof; otherwise, give a counterexample
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