Hi...
I've been trying to apply various tutorials to solve my particular problem to no avail... i suppose mine would be a very common issue but i see no postings about a solution..
ok so...
i have the last 8 months of paypal records. I want to
a. mark the very first occurance of every email address for one time buyers and repeat buyers chronologically. So... i will know how many new customers we served every day.
b. total up the gross payment amounts of each new customer after any date. For instance, if we did a seminar in april, I want to know the total spending of only the new customers ... defined as anyone who has not purchased anything from january to the date of the seminar.
help??? =)
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