Transaction Share of User Spend
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 measure every purchase in `transactions` against everything its user has ever spent, and each purchase keeps its own line. Return each transaction's ID, the username from `users`, the amount and that share.
Summary
Each transaction's share of the whole.
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