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Ma Zongmin, Yan Li. Using Multivalued Logic in Relational Database Containing Null Value[J]. Journal of Computer Science and Technology, 1996, 11(4): 421-426.
Citation: Ma Zongmin, Yan Li. Using Multivalued Logic in Relational Database Containing Null Value[J]. Journal of Computer Science and Technology, 1996, 11(4): 421-426.

Using Multivalued Logic in Relational Database Containing Null Value

  • In this paper, several kinds of multivalued logic for relational database and their developing process are presented on the basis of null value's semantics. A new 5 valued logic is led into relational database containing null talue. The feasibility and necessity of using 5 valued logic are expounded. Comparative calculation and logical calculation under 5 valued logic are defined at the end of the paper.
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