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

L3

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.

Summary

Monthly reach, campaign by campaign.

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