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Cumulative Sum by distinct customer ID by year

Hi - I've seen some posts here regarding the SUM OVER function to calculate the cumulative sum.  My problem at hand is slightly different, where I need to keep a running total of distinct purchasers by year:
Year        #Distinct Customers         #Cumulative (Distinct Customers)

By barthouston, 22 Apr 2014 | Tagged: cumulative sum Analytical Window Function running total | 20 comments