The Accumulator
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 FinOps dashboard needs a daily cloud cost time series so stakeholders can see how spending accumulates through the billing period. From cloud_costs, show each billing date, its total spend that day, and the cumulative spend through that date.
Summary
A total that builds row by row. Structure the query to match.
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