Net Lines

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Problem

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).

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.