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fourth normal form

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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… …   Wikipedia

  • Fourth Normal Form —   [engl.], in einer relationalen Datenbank die vierte Normalform …   Universal-Lexikon

  • fourth normal form — noun A stage in the normalization of a relational database in which a database is in Boyce Codd normal form and all multi valued dependencies are functional dependencies. See Also: first normal form, second normal form, third normal form …   Wiktionary

  • fifth normal form — noun A stage in the normalization of a relational database in which a database is in fourth normal form and every join dependency is implied by the candidate keys. See Also: first normal form …   Wiktionary

  • Third normal form — The third normal form (3NF) is a normal form used in database normalization. 3NF was originally defined by E.F. CoddCodd, E.F. Further Normalization of the Data Base Relational Model. (Presented at Courant Computer Science Symposia Series 6, Data …   Wikipedia

  • second normal form — noun A stage in the normalization of a relational database in which it is in first normal form and every non key attribute is dependent upon the entire primary key. See Also: first normal form …   Wiktionary

  • third normal form — noun A stage in the normalization of a relational database in which a database is in second normal form and all non key attributes are mutually independent (no transient dependencies.) See Also …   Wiktionary

  • first normal form — noun A stage in the normalization of a relational database in which repeating groups and attributes have been eliminated by putting each into a separate table connected by a primary key foreign key relationship. See Also: second normal form …   Wiktionary

  • First normal form — (1NF or Minimal Form) is a normal form used in database normalization. A relational database table that adheres to 1NF is one that meets a certain minimum set of criteria. These criteria are basically concerned with ensuring that the table is a… …   Wikipedia

  • Jordan normal form — In linear algebra, a Jordan normal form (often called Jordan canonical form)[1] of a linear operator on a finite dimensional vector space is an upper triangular matrix of a particular form called Jordan matrix, representing the operator on some… …   Wikipedia

  • Domain/key normal form — (DKNF) is a normal form used in database normalization which requires that the database contains no constraints other than domain constraints and key constraints. A domain constraint specifies the permissible values for a given attribute, while a …   Wikipedia


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