109. Differentiating between past and current customers

In Bindle’s data warehouse we have a privilege to check whether a user is a customer or not by a value of the status column. Users with the customer status have full access to the Bindle’s book catalog.

The value of the status column is dynamic – subscriptions expire and for these users the status is set back to free.

It’s important to understand when we’re running queries and calculating ARPU, CAC etc – are we considering only current customers or the past customers as well?

Knowing the amount of customers we’ve ever had could help us...

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Anatoli Makarevich, author of SQL Habit About SQL Habit

Hi, it’s Anatoli, the author of SQL Habit. 👋

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