Fourth normal form (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Fourth normal form" in English 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, Ronald (September 1977). "Multivalued Dependencies and a New Normal Form for Relational Databases" (PDF). ACM Transactions on Database Systems. 2 (1): 262–278. CiteSeerX 10.1.1.69.1872. doi:10.1145/320557.320571. S2CID 14617155. Archived from the original (PDF) on 2007-11-29. Retrieved 2008-04-26.
Wu, Margaret S. (March 1992). "The Practical Need for Fourth Normal Form". ACM SIGCSE Bulletin. 24 (1): 19–23. 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, Ronald (September 1977). "Multivalued Dependencies and a New Normal Form for Relational Databases" (PDF). ACM Transactions on Database Systems. 2 (1): 262–278. CiteSeerX 10.1.1.69.1872. doi:10.1145/320557.320571. S2CID 14617155. Archived from the original (PDF) on 2007-11-29. Retrieved 2008-04-26.

"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, Ronald (September 1977). "Multivalued Dependencies and a New Normal Form for Relational Databases" (PDF). ACM Transactions on Database Systems. 2 (1): 262–278. CiteSeerX 10.1.1.69.1872. doi:10.1145/320557.320571. S2CID 14617155. Archived from the original (PDF) on 2007-11-29. Retrieved 2008-04-26.

"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, Ronald (September 1977). "Multivalued Dependencies and a New Normal Form for Relational Databases" (PDF). ACM Transactions on Database Systems. 2 (1): 262–278. CiteSeerX 10.1.1.69.1872. doi:10.1145/320557.320571. S2CID 14617155. Archived from the original (PDF) on 2007-11-29. Retrieved 2008-04-26.

"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, Ronald (September 1977). "Multivalued Dependencies and a New Normal Form for Relational Databases" (PDF). ACM Transactions on Database Systems. 2 (1): 262–278. CiteSeerX 10.1.1.69.1872. doi:10.1145/320557.320571. S2CID 14617155. Archived from the original (PDF) on 2007-11-29. Retrieved 2008-04-26.