efNine efnine

Note: I'm currently taking a break from this course to focus on my studies so I can finally graduate

	with
	dau as (
	-- This part of the query can be pretty much anything.
	-- The only requirement is that it have three columns:
	-- dt, user_id, inc_amt
	-- Where dt is a date and user_id is some unique identifier for a user.
	-- Each dt-user_id pair should be unique in this table.
	-- inc_amt represents the amount of value that this user created on dt.
	-- The most common case is
	-- inc_amt = incremental revenue from the user on dt

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