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Normalization refers to transformations which aim to reduce variation of various types of data and thereby allow more consistent processing, searching, sorting, comparison, etc. Courtesy of [SO Normalization tag](http://stackoverflow.com/tags/normalization/info).

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The question, and many of the answers, miss the important point that all the natural keys for each table reside solely in the logical schema for the database, and all the surrogate keys for each table …
answered Aug 21 '16 by Pieter Geerkens