Daily Cross-Platform Users
A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
The growth team is tracking daily cross-platform engagement for mobile and web users. For each date, count the unique users who had at least one session on a 'mobile' or 'web' device. Show the date and the user count, chronologically.
Summary
Mobile and web. Same day, same users?
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