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8. Assume the schema consists of two relations R(A, B, C) and S(D, E). Consider the following eries in relational algebra: A,C re algebrai c

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8. Assume the schema consists of two relations R(A, B, C) and S(D, E). Consider the following eries in relational algebra: A,C re algebrai c expressions (a) and (b) equivalent? Use no more than two sentences to explain your

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