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- Fourth_normal_form abstract "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.".
- Fourth_normal_form wikiPageExternalLink 0,1144,0321197844,00.html.
- Fourth_normal_form wikiPageExternalLink simple5.htm.
- Fourth_normal_form wikiPageExternalLink rm8.html.
- Fourth_normal_form wikiPageID "202567".
- Fourth_normal_form wikiPageRevisionID "604906629".
- Fourth_normal_form hasPhotoCollection Fourth_normal_form.
- Fourth_normal_form subject Category:Database_normalization.
- Fourth_normal_form comment "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.".
- Fourth_normal_form label "Cuarta forma normal".
- Fourth_normal_form label "Fourth normal form".
- Fourth_normal_form label "Четвёртая нормальная форма".
- Fourth_normal_form sameAs Cuarta_forma_normal.
- Fourth_normal_form sameAs m.01csb6.
- Fourth_normal_form sameAs Q2492261.
- Fourth_normal_form sameAs Q2492261.
- Fourth_normal_form wasDerivedFrom Fourth_normal_form?oldid=604906629.
- Fourth_normal_form isPrimaryTopicOf Fourth_normal_form.