The Undone
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L4
Interview Prompt
A reliability review is auditing the databases where migrations have been rolled back. For each of those databases, report its total migration count and how many of those migrations were rolled back, most rollbacks first.
Summary
Some migrations don't stick. Find the databases where they keep coming undone.
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