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Monthly Unique Users per Campaign
A easy SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- junior
Problem
For each ad campaign and month, count the unique users who received an impression. Assume all data falls within the same year. Return the campaign, month, and unique user count.
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.