Exercise 19.18 Consider a relation R with attributes ABCDE. Let the following FDs be given: A → BC, BC → E, and E → DA. Similarly, let Sbe a relation with attributes ABCDE and let the following FDs be given: A → BC, B → E, and E → DA. (Only the second dependency differs from those that hold over R.) You do not know whether or which other (join) dependencies hold.
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