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If there are n tuples in the partition and the rank of the tuple is r, then its ________ is defined as (r −1)/(n−1).

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If there are n tuples in the partition and the rank of the tuple is r, then its ________ is defined as (r −1)/(n−1).

(a) Ntil()

(b) Cum_rank

(c) Percent_rank

(d) rank()

This question was addressed to me in my homework.

I want to ask this question from Recursive Queries and Aggregation Features in portion SQL : Queries, Constraints and Triggers of Database Management

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The correct option is (c) Percent_rank

Explanation: Percent rank of a tuple gives the rank of the tuple as a fraction.

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