Question
Given a relation R(A, B, C, D, E) and functional
dependencies {A -> B, BC -> D, D -> E}. Which of the following is a candidate key for R?Solution
(AC)+ = A, C, B (from A->B), D (from BC->D), E (from D->E). So (AC)+ = {A, B, C, D, E}. No proper subset of AC can determine all attributes.
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