The Long Watch
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
- mid
Interview Prompt
We're auditing our release cadence, where each successful production deploy of a service stays live until the next successful production deploy of that same service replaces it. The environment and status labels were recorded with inconsistent casing over the years, so match them case-insensitively. For every release that was eventually replaced, report the service, the version, and how many calendar days it stayed live, longest-lived first; when two releases held for the same number of days, list them alphabetically by service and then the earlier deploy first.
Summary
Every release holds until the next one relieves it. Find the ones that held longest.
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