Spending Velocity
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
- L5
Interview Prompt
A fraud model watches each customer's spending pace, so for every purchase in the transactions table we need a trailing total of that customer's recent purchase amounts, up to and including that purchase. Return user_id, transaction_date, total_amount and that trailing total.
Summary
Fraud hides in the pace, not the price. Watch each customer's last seven purchases roll forward.
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