citusdata / citusdata/postgresql-hll

Calculating New Daily Users

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Description

In the [`On Unions and Intersections`](https://github.com/citusdata/postgresql-hll#on-unions-and-intersections), the link to a blog with additional information is dead (#97). Could you suggest other resources on working the intersections?

Specifically I'm interested in how to determine counts of new users at a daily level, where a new user is a unique user on day `N` where that user hasn't existed for days `N-1..N-M`; I'm having trouble finding good information.

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