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Volume 11 Issue 4
July  1996
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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.
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Using Multivalued Logic in Relational Database Containing Null Value

  • Shenyang Institute of Automation; Chinese Academy of Sciences; Shenyang 110015; Liaoning Workers Movement College; Shenyang 110168;

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  • Published Date: July 09, 1996
    Abstract
  • 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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    • References (3)
  • [1]
    Codd.E.F. Missing information (applicable and inapplicable) in relational databases. SIGMOD Rec., 1986, 15(4): 781-823.
    [2]
    Codd.E.F. More commentary on missing information (applicable and inapplicable) in relational databases. SIGMOD Rec., 1987, 16(1): 453-468.
    [3]
    Gessert.G.H. Four valued logic for relational database system. SIGMOD Rec., 1990, 19(1):351-367. ……….
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