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An aggregate is a group made up of a collection of items. Aggregated data is data that has been summed or grouped - hopefully according to a logical pattern. We need aggregated data because a heap of unsorted data is useless. Thus if you had a database which collected names and addresses you would aggregate street names into one group, and family names into another (otherwise your scrambled data might lead you to believe Mr. Walnut lives on Smith Street).

You can manipulate aggregates to form other aggregates, for instance grouping all of your products made in Rome, Copenhagen and Paris into an aggregate of products manufactured in Europe. You can also enumerate the pieces within your aggregate so that you can make comparisons between them. Are the collective sales of the North American division larger or smaller than the European one (for instance)?

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Q: What is aggregated data and why do you need aggregated data?
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