Negyedik normálforma (Hungarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Negyedik normálforma" in Hungarian language version.

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"A relation schema R* is in fourth normal form (4NF) if, whenever a nontrivial multivalued dependency X $\twoheadrightarrow$ Y holds for R*, then so does the functional dependency X → A for every column name A of R*. Intuitively all dependencies are the result of keys." Fagin (1977. szeptember 1.). „Multivalued Dependencies and a New Normal Form for Relational Databases”. ACM Transactions on Database Systems 2 (1), 262–278. o. [2007. november 29-i dátummal az eredetiből archiválva]. DOI:10.1145/320557.320571. (Hozzáférés: 2008. április 26.)
Wu (1992. március 1.). „The Practical Need for Fourth Normal Form”. ACM SIGCSE Bulletin 24 (1), 19–23. o. DOI:10.1145/135250.134515.

"A relation schema R* is in fourth normal form (4NF) if, whenever a nontrivial multivalued dependency X $\twoheadrightarrow$ Y holds for R*, then so does the functional dependency X → A for every column name A of R*. Intuitively all dependencies are the result of keys." Fagin (1977. szeptember 1.). „Multivalued Dependencies and a New Normal Form for Relational Databases”. ACM Transactions on Database Systems 2 (1), 262–278. o. [2007. november 29-i dátummal az eredetiből archiválva]. DOI:10.1145/320557.320571. (Hozzáférés: 2008. április 26.)

"A relation schema R* is in fourth normal form (4NF) if, whenever a nontrivial multivalued dependency X $\twoheadrightarrow$ Y holds for R*, then so does the functional dependency X → A for every column name A of R*. Intuitively all dependencies are the result of keys." Fagin (1977. szeptember 1.). „Multivalued Dependencies and a New Normal Form for Relational Databases”. ACM Transactions on Database Systems 2 (1), 262–278. o. [2007. november 29-i dátummal az eredetiből archiválva]. DOI:10.1145/320557.320571. (Hozzáférés: 2008. április 26.)