The Faithful Few
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
- L4
Interview Prompt
We track sessions across many devices for a multi-platform product. For each device type, count the users who have only ever used that single device type across all of their sessions, and return the device type with that exclusive user count.
Summary
Loyal to one platform only.
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