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We just learned how to take two data sets with the same fields and union them together to make a longer data set. But what if you want to blend multiple data sets with different data? For instance, pretend we want to create this really great 360 view of our customers, so we can build a predictive model from it. Well want to start with as much information about the customers that we can get, before we can determine which variables well want to use in the model. Well take a transaction data set thats summarized to the customer level, showing their total transactions, total spend, etc. Then we might want to use another data set that shows what marketing campaigns they responded to. Maybe, we can even pull in a third data set with their address data showing how far these customers are located from their store locations. To blend these data sets together, well need some information in common amongst all three of these files. That information in common is whats going to tie each record
