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Customer Behavior Analysis in SQL Server

Introduction
Churned customers
Customer retention charts
Summary
10. Question 1

Instruction

Let's start with Question 1!

Exercise

Find the number of churned customers in weekly registration cohorts. Show the following columns: Year, Week, and ChurnedCustomers. Define churned customers as customers who haven't placed an order in the last 90 days. Order the results by year and week.

Stuck? Here's a hint!