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Mobile vs Desktop Session Duration

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

Domain
SQL
Difficulty
medium
Seniority
L4

Interview Prompt

We're comparing mobile-versus-desktop engagement over the last year. For each user, put their longest session on each of those two device types side by side, one row per user.

Summary

Mobile versus desktop. Who stays longer?

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

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