Question: (A)120%) Give the hash-based algorithm for evaluating the projection operator with duplicate elimination. (B)[2006] Give the improved merge-sort join algorithm that avoids merging the joined

(A)120%) Give the hash-based algorithm for evaluating the projection operator with

(A)120%) Give the hash-based algorithm for evaluating the projection operator with duplicate elimination. (B)[2006] Give the improved merge-sort join algorithm that avoids merging the joined relations twice (Hint: give all the steps)

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