Classify Accounts by Activity Tier

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

Domain

SQL

Difficulty

hard

Problem

The analytics team wants to find the highest latency value that appears exactly once across all API calls. First identify latency values that occur only one time, then find the maximum among those.

Practice This Problem

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