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Services With Multi-Quarter Uptime
A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- mid
Problem
The SRE team considers a service stable only if it recorded healthy checks across multiple quarters. Find services that had at least one healthy check (case-insensitive) in at least two separate quarters of 2026.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.