The Long Tail

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

One average hides everything. Find where the slow calls live.

Practice This Problem

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