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Token Churn Rate
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid, senior
Problem
Compute churn for API tokens in September 2026. Churn rate is the difference between tokens active on September 1 and tokens active on September 30, divided by the count on September 1. A token is active if it was issued on or before the target date and either has no expiration or expires on or after that date. Return a single churn rate.
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.