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I need a DAX measure which shows me a flag (1 or 0) if a customer (DimCustomer) bought the product "A" someday (for the first time) and later (doesn't matter when) have bought or product "B" or "C".
Measure1: Flag (1 or 0) in their customer names if bought
Measure2: When was the first time that they bought product B or C
Basicly I have a FactSales, DimCustomer, DimDate and Dimproduct
Can someone help me?