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

Domain

SQL

Difficulty

hard

Problem

An SRE flagged a latency outlier. Find the highest latency value that appears at most twice across all API calls. First identify latency values that occur once or twice, then find the maximum among those.

Summary

The accounts fall into tiers. Where is the cutoff?

Practice This Problem

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