One Year to the Next
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
- L5
Interview Prompt
We track user signups and want to know how our signup activity spreads across the calendar. For each signup year, report how many separate days had at least one new user, the prior year's figure, and the percentage change from that prior year.
Summary
This year versus last year. Growing or shrinking?
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