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Find users who have never made an API call with a status of 400 or higher

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

Interview Prompt

Find users who have never made an API call with a status of 400 or higher. Be careful about NULL safety in your subquery. Return user_id and username.

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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