Research on （N）4NF,（N）5NF Under Null Value Circumstances

Research on （N）4NF,（N）5NF Under Null Value CircumstancesJ. Journal of Computer Research and Development, 1995, 32(2).

Citation:

Research on （N）4NF,（N）5NF Under Null Value CircumstancesJ. Journal of Computer Research and Development, 1995, 32(2).

Citation:

Research on （N）4NF,（N）5NF Under Null Value CircumstancesJ. Journal of Computer Research and Development, 1995, 32(2).

Abstract

In this paper, 4NF, 5NP under null value circumstances are discussd on the basis of literature 1, 2, 3, and 4. With the corresponding definitions and relevant concepts given, the related theories are studied. The algorihm to decompose to （N）4NF is also given.

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