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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
L4

Interview Prompt

For each experiment, show the number of users in control, the number in treatment, and the ratio of treatment to control. If an experiment has no control users, the ratio should be null.

Summary

Control versus treatment. The participation split.

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

Related

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