Active User Penetration Rate
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
- L5
Interview Prompt
The product analytics team wants to know how deeply each device type has taken hold with its users. For every device type, report the share of its users who count as genuinely active on it, where being active means recent, frequent, and heavy use combined. Return each device type with its penetration rate.
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 your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision