Campaign Conversion Window

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

Domain

SQL

Difficulty

hard

Seniority

senior, staff

Problem

Our ad platform logs impressions, clicks, and purchases. For each campaign, compute the click-through rate and the conversion rate as percentages rounded to 2 decimal places. A conversion means a user who clicked an ad and then made a purchase within 7 days. Only include campaigns with at least 3 impressions.

Practice This Problem

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