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Given that a customer's name can change, perhaps it is an attribute of the purchase.
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Given that nothing in the Universe is constant and everything can change, I would suggest to have one table CustomerPurchase and make all attributes to be attributes of purchase...
:hehe:
It's right for pointer to customer address and price to be attributes of the purchase. But,
it is wrong for customer name. Even if customer name has changed, you will most likely want to see and report all existing purchases with the new name not he old one, until you want datawarehouse changing dimension.