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Healthiest Service Check History

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, senior

Interview Prompt

Find the service(s) with the highest-ever uptime score, then for those services show each check date, the previous check date, and the gap in days between them. Results should be ordered by check date, most recent first.

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