Active User Penetration Rate
A hard SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
The product analytics team wants to know how deeply each device type has taken hold with its users, working from the session log in user_sessions and the device catalog in devices. For every device type, report the share of its users who are genuinely active on it, meaning recent, time-heavy and page-heavy use all at once, listed from the deepest penetration to the shallowest.
Summary
How much of the user base is actually alive?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision