| Summary: | In this video, Carl Gold goes through the milestone number 1: Identifying Churned Customers, which is a part of his liveProject: Fighting Churn with Manning's liveBook Data. The objective of this milestone is: - Your boss at Manning has assigned you the following task: Figure out how often customers repeatedly buy books in different calendar quarters (3-month periods). Repeat-purchase customers are considered to be "retained," and customers who do not make a repeat purchase are considered to have churned. (A repeat-purchase customer is one who, having bought a book in one 3-month period, buys another book in the following 3-month period.) - Your boss has further specified that you should save the list of the customers who did and did not make repeat purchases in the database
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