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Peak Activity by Device

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

Domain
SQL
Difficulty
easy
Seniority
senior, staff

Interview Prompt

For each device type, find the session time window (from session start to session start plus duration) with the highest number of concurrent users. Show device type, the time period as 'start to end', and user count.

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