Data teams at companies like Stripe use SQL to verify that loaded or transformed data matches expectations before dashboards, reports, or downstream models rely on it. Interviewers ask this to assess whether you can use SQL as a practical testing tool, not just for analysis.
Explain how you would use SQL to verify data during testing. In your answer, cover:
Keep the answer focused on common SQL-based validation patterns used in analytics engineering, ETL testing, or QA. The interviewer is looking for a structured approach, clear examples, and awareness of common failure modes rather than advanced database internals.