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I have a master customer database with a list of customers and addresses. Some of these customers have listed the product they purchased (some dont). I have another spreadsheet (data 2) that again gives a lot of the custom names and addresses where no product is given in the master database. So I would basically like the product purchased added to the master database (I'm sure you could do this by post code and surname to match data). If there already exists a product purchased on the master customer database for a given customer - I would like this left and no data transferred. ie - only add data where product purchased is blank.