Use a self join on code_reviews to find distinct pairs of authors who have reviewed the same repo

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

Domain

SQL

Difficulty

medium

Problem

Use a self join on code_reviews to find distinct pairs of authors who have reviewed the same repo. Use author_1 < author_2 to avoid duplicate pairs

Practice This Problem

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