Successful Call Volume per Endpoint

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

Domain

SQL

Difficulty

medium

Seniority

L5

Problem

The API gateway logs duplicate events from retry middleware. In the api_calls table, duplicate rows share the same user_id, endpoint, and call_time. Keep only the row with the lowest call_id from each duplicate group. After deduplication, find the total number of successful calls per endpoint. A successful call has status equal to 200. Return each endpoint and its successful call count, ordered from most to fewest.

Summary

Not every ping is honest.

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