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I know in the exercise we eliminate Customer ID 787 as it is duplicated, but how do we know that the correct annual transactions is 86? It could be 100 (as in the second file record associated with Customer ID 787).
And how do we select it if we know the second one is the correct value to use? Is the default the "first" read item per ID??
I know it is a practice exercise, but maybe you could have used exact duplicates? Although I also know that not using exact ones piqued my interest more, so thank you!!