Top Campaign by Opens

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Our push notification system tracks opens per campaign. Find which campaign drove the most opens. An 'open' counts when the opened flag is true. If campaigns are tied at the top, show all of them.

Summary

One campaign got all the opens.

Practice This Problem

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