@Iguinn, the answer looks promising. Just to have some more clarity, the events are something like this:
Event A = a user registration event (usually happens only once per user)
Event B = a user doing a payment on our application (could happen many times for a user or never at all).
So what I'm looking at is the list of users who have registered but have not yet done even a single payment. Hope this clarifies.
Thanks!
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