Net Lines
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
- L3
Interview Prompt
Engineering wants to see who is growing the codebase versus trimming it. Each commit records lines added and lines removed. For each author, compute their net line contribution (total added minus total removed).
Summary
Some authors build. Others trim. The net tells the truth.
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