Who We Reached

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

Domain

SQL

Difficulty

easy

Seniority

L3

Problem

The growth team is tracking how each ad campaign's reach moves month over month, where every impression falls within a single year. For each campaign and calendar month, find how many different users saw an impression, sorted by campaign and then by month.

Summary

Monthly reach, campaign by campaign.

Practice This Problem

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