The Shape of Waiting

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

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

We're running a latency review across the API and want to see how each endpoint's response times spread out rather than collapse into a single average. Split every endpoint's calls into four equal-sized tiers running from fastest to slowest, and for each endpoint-tier report the fastest, slowest, and average latency, skipping any call that has no recorded latency.

Summary

Every request waits its turn, and some wait far longer than the rest. Map where the patience runs out.

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