The Notification That Paid Off
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
Each row of `transactions` is one purchase, and whatever a user bought on their first day of purchasing is their starting basket. Report how many users went on to buy something outside that basket within a year of that first day, and how many such purchases they made.
Summary
The message went out to thousands. A smaller number actually bit.
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