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apache beam is built to handle large amounts of data but what happens when you need to group data together or even work with multiple data sets lets go over a few different ways that you can join data in bean [Music] to get things started lets look at a simple example grouping data on a specific key well use some data from an e-commerce website that shows which items a user viewed each row in this p collection represents a user viewing a specific item from the store the first column shows the id of the user and the second column shows a unique id of the item that they viewed if youre just looking for a count of items you dont need to do anything fancy using beams count aggregation does exactly what it sounds like and counts the number of elements of course youll probably also want to look at each user independently so you can count per key to get the number of items each user looked at while thats fine for getting the number of elements you might also want the actual elements
