The Screens They Carry
A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
The product team is profiling how the 25-34 age cohort spreads its usage across hardware. Count the unique devices these users touch, broken down by device type.
Summary
One age cohort, and every kind of screen it reaches for.
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