Running Tab
A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
Finance wants to see how each customer's spending accumulates over time. For every row in transactions, compute a per-user running sum of total_amount ordered by transaction_date. Return the user_id, transaction_date, total_amount, and the cumulative spending through that row.
Summary
Every purchase adds to the total. Watch the tab grow.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision