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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Our push notification system records an `opened` flag on every notification along with the campaign that sent it. Find the campaigns that pulled fewer opens than the average campaign, listed with the fewest opens first.

Summary

Every campaign fights for the tap. Find the ones the field is leaving behind.

Practice This Problem

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