Daily Spam Impression Rate

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

An ad impression is considered spam if its campaign name contains 'spam'. Limit to users who also appear in page_views. For each day, compute the percentage of spam impressions among all qualifying impressions. Show the date and spam percentage.

Summary

How much of the ad feed is spam?

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