Fastest and Slowest Services by Region

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

Domain

SQL

Difficulty

hard

Seniority

mid

Problem

For each region, surface the highest and lowest latency services, excluding any region whose name contains 'test'. If services tie for the top or bottom spot, include all of them.

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.