Most Efficient High-Volume Campaign

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

Domain

SQL

Difficulty

hard

Seniority

L4

Problem

We want the campaign with the lowest peak monthly spend that still delivers at least 1 click every month it runs. Monthly clicks are the sum of clicked impressions, and monthly spend is the sum of revenue. Return just the campaign name.

Summary

High volume. Low cost. The dream campaign.

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