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A hard SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- mid
Problem
An SRE flagged a latency outlier. Find the highest latency value that appears exactly once across all API calls. First identify latency values that occur only one time, then find the maximum among those.
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.