Seen or Ignored

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

Our push notification system logs every send along with whether the recipient opened it. Find each platform's fraction of sent notifications that were opened, strongest open rate first.

Summary

A send is only half the story. Find where the taps actually land.

Practice This Problem

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