Question: Given relation r (a, b, d, d), Show how to use the extended SQL features to generate a histogram of d versus a, dividing a

Given relation r (a, b, d, d), Show how to use the extended SQL features to generate a histogram of d versus a, dividing a into 20 equal-sized partitions (thatis, where each partition contains 5 percent of the tuples in r, sorted by a).

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