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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.

Attributes	Values
rdfs:label	Fourth normal form (en)
rdfs: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. 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. (en)
sameAs	Fourth normal form
dbp:wikiPageUsesTemplate	dbt:ISBN dbt:Refbegin dbt:Reflist dbt:Short_description dbt:Database_normalization
Subject	Database normalization
Link from a Wikipa... related subject.	dbpedia-de:Normalisierung_(Datenbank)
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Fourth_normal_form?oldid=948097191&ns=0
Wikipage page ID	202567 (xsd:integer)
page length (characters) of wiki page	7962 (xsd:nonNegativeInteger)
Wikipage revision ID	948097191 (xsd:integer)
Link from a Wikipage to another Wikipage	Ronald Fagin Super key Table (database) Attribute-value system Bijection Boyce–Codd normal form Candidate key Database normalization Second normal form Data redundancy Domain-key normal form Functional dependency If and only if Fifth normal form Injective function Multivalued dependency Third normal form dbr:Rissanen's_theorem
has 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. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Fourth_normal_form
is Wikipage redirect of	4NF 4th normal form
is Link from a Wikipage to another Wikipage of	Domain-key normal form List of computing and IT abbreviations Domain-key normal form Index of computing articles Fifth normal form Multivalued dependency 4NF 4th normal form
is foaf:primaryTopic of	http://en.wikipedia.org/wiki/Fourth_normal_form

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