The Last Checkout
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
The retention team wants to understand every user's most recent checkout. For each user in `transactions`, find the most recent date they made a purchase and how many purchase rows they had on that date.
Summary
Their last visit. Everything in the bag.
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