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Most Efficient Region by Token Usage

A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
hard
Seniority
mid

Interview Prompt

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.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision