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

Domain

SQL

Difficulty

hard

Seniority

L3

Problem

For successful API calls (status 200), compute the mean latency, variance, and standard deviation.

Summary

How much does latency actually vary?

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.