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Fifth Normal Form (5NF) - (1) A relation R is in fifth normal form (5NF) (also called Projection Join Normal Form (PJ/NF)) if and only if every join dependency in R is a consequence of the candidate keys of R. (2) A table is in 5NF if a relation or record in which all elements within a concatenated key are independent of each other and cannot be derived from the remainder of the key.
Source: Larry English, http://www.iaidq.com/main/glossary.shtml , 26-Jan-2009 09:23
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