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7-Day Onboarding Conversion

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
senior

Interview Prompt

The growth team is evaluating early onboarding for a board review. For users who entered an experiment during the first 7 days of January 2026, determine what percentage completed at least one meaningful session (duration greater than zero) within 7 days of entering the experiment. Break the results down by platform and experiment entry date, showing total users, converted users, and the conversion percentage.

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