Feature Flag Fan vs Detractor Pairs

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

Domain

SQL

Difficulty

hard

Seniority

L5

Problem

Rank enabled users by rollout percentage descending, and disabled users by rollout ascending. Pair the #1 fan with the #1 detractor, #2 with #2, and so on. Break ties by flag ID ascending, and show both user IDs.

Summary

Some users love the flag. Others want it gone.

Practice This Problem

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