Active User Open Rate

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

Domain

SQL

Difficulty

medium

Seniority

junior, mid

Problem

The engagement team is measuring notification effectiveness for the quarterly product review. Compute the percentage of all push notifications that were both sent to a user with an active account and opened by the recipient. Notifications should still be counted in the denominator even if the user's account record no longer exists.

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