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Volume 11 Issue 4
July  1996
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Li Tianzhu, Xiao Jitian, Sun Zhaohao, Bian Xiaofan. Normalization of Class Hierarchy in Databases[J]. Journal of Computer Science and Technology, 1996, 11(4): 356-364.
Citation: Li Tianzhu, Xiao Jitian, Sun Zhaohao, Bian Xiaofan. Normalization of Class Hierarchy in Databases[J]. Journal of Computer Science and Technology, 1996, 11(4): 356-364.
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Normalization of Class Hierarchy in Databases

  • Hebei University; Baoding 071002;

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  • Published Date: July 09, 1996
    Abstract
  • In complex object oriented databases, the purpose of introducing class hierarchy is to express ISA sematics, to realize inheriting and to reuse schema definition codes. The schema definition and schema evolution, based on the partial order of lattice, often cause the loss of information inheriting and the redundance of schema dedrition. Based on the fullness of the inheritance shownby class hierarchy three normal forms of class hierarchy are given in this paper, and a general algorithm of normalization of c…
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    • References (3)
  • [1]
    Abiteboul.S et al. Objects and Views. In Proc. of SIGMOD, 1991.
    [2]
    Alhajj.R, Arkun.M. A query model for object-oriented database. In IEEE Int'l. Conf on Data Engineering, 1993.
    [3]
    Bancilhon.F, Khoshafian.S. A Calculus for Complex Objects. ACM-SIGMOD-SIGACT-SIGART, 1986. ……….
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