Find users who have never made an API call with a status of 400 or higher

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

Domain

SQL

Difficulty

medium

Problem

Find users who have never made an API call with a status of 400 or higher. Be careful about NULL safety in your subquery. Return user_id and username.

Practice This Problem

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