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Surrogate Keys are used to abstract the link between related tables using a value that has no direct bearing on the actual data stored in the rows using the surrogate key. The advantages of this style of key include the ability to edit any part of a row without having to update key values in related tables. Natural Keys are the complement of Surrogate Keys; more info can be found at http://dba.stackexchange.com/tags/natural-key/info

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