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

Domain

SQL

Difficulty

hard

Seniority

L5

Problem

Find services that experienced at least one month of declining uptime followed by at least one month of growth. For each qualifying service, return the service name, the month the decline started, the month growth resumed, and the growth ratio from lowest uptime to peak: (peak minus lowest) divided by lowest.

Summary

It was down. Then it came back. Stronger.

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