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Next to Last Date
I have a table that tracks each customers visit to my store. I hold
promotions on occaision that bring customers that haven't visited my store in awhile. When I hold a promotion, I'm trying to determine the number of days since the last visit for each customer. For example, here is a sample customer: Account_No Visit_Date 1234 4/19/10 1234 4/10/10 1234 3/10/10 1234 2/13/10 This customer generally visits once a month. Assuming that I held a promotion on 4/19/10, I want to calculate the number of days since the most recent visit, in this case being 4/10/10 (9 days). The goal is to see if I have affected their trip pattern by holding the promotion and if I was able to generate an incremental trip by holding the promotion. |
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