Total Hours Between Consecutive Events
A hard 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
- hard
- Seniority
- L4
Interview Prompt
`event_data` holds one row per event with its `event_type`, `event_timestamp` and `user_id`. Report the total hours each event type spent in quiet stretches, where a quiet stretch is a gap of more than 30 days between one event of that type and the next.
Summary
Hours between state changes.
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