Biggest Deployment Decline
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
An on-call engineer tracing a surge in release cadence is comparing each service's deploys in `deploy_logs` for 2026 against 2025, for the services `svc_health` also monitors. Return the service whose deploy count grew the most, along with by how many deploys.
Summary
One team's deploy count cratered. Which one?
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