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What (who) is 4NF - definition
NORMAL FORM USED IN DATABASE NORMALIZATION
4NF; 4th normal form
fourth normal form
Fourth normal form
Fourth normal form (4NF) is a normal form used in database normalization. Introduced by Ronald Fagin in 1977, 4NF is the next level of normalization after Boyce–Codd normal form (BCNF).
Wikipedia
Fourth normal form
Fourth normal form (4NF) is a normal form used in database normalization. Introduced by Ronald Fagin in 1977, 4NF is the next level of normalization after Boyce–Codd normal form (BCNF). Whereas the second, third, and Boyce–Codd normal forms are concerned with functional dependencies, 4NF is concerned with a more general type of dependency known as a multivalued dependency. A table is in 4NF if and only if, for every one of its non-trivial multivalued dependencies X Y, X is a superkey—that is, X is either a candidate key or a superset thereof.
Examples of use of 4NF
1. Yours faithfully, ROBERT RANDELL, 6 Rose Court, 22 Kirkdale, Sydenham, SE26 4NF.