iOS Sessions by Device Type
A medium 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
- medium
- Seniority
- L3
Interview Prompt
Sessions in user_sessions record only which device they came from; each device's type and operating system are kept in devices. For sessions started on mobile devices, report how many sessions each operating system accounts for.
Summary
iOS engagement, 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