Sessions Per Device Type
An easy 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
- easy
- Seniority
- L3
Interview Prompt
Our session report only lists device ids, so nobody can see which kinds of devices our traffic actually comes from. Each session in `user_sessions` records the device it ran on and the `devices` catalog holds each device's type: how many sessions happened on each device type?
Summary
Sessions, device by device.
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