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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
junior, mid

Interview Prompt

The engagement team is measuring notification effectiveness for the quarterly product review. Compute the percentage of all push notifications that were both sent to a user with an active account and opened by the recipient. Notifications should still be counted in the denominator even if the user's account record no longer exists.

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