Most Efficient Region by Token Usage

A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

Our API tokens have issued and expiration dates plus a request count. For each region, compute the average token lifetime in days (expires minus issued) and the average number of requests. Then calculate the ratio of average requests to average lifetime, ranked highest first. Return the region, average lifetime in days, average requests, and the requests-per-day ratio.

Summary

Some regions squeeze more out of every token.

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