模糊数据库中的关系代数转换规则

Algebraic Transformation in Fuzzy Relational Databases

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摘要关系代数等效转换规则是查询优化中非常重要的一种方法.本文首先总结了模糊关系数据库中关系代数的研究现状;然后在基于模糊关系的关系数据库模型中,对传统的关系代数转换规则做了扩展,证明了这些规则在基于模糊关系的关系数据库中仍然是成立的;最后举例对其中的一些转换规则做了说明.

作者唐晓辉陈国青

出处《模糊系统与数学》 CSCD 2004年第z1期242-246,共5页 Fuzzy Systems and Mathematics

基金然科学基金(79925001/70231010)和国家教育部博士点基金(20020003095).

关键词基于模糊关系的关系数据库模型关系代数转换规则串连性交换性

参考文献12

1[1]E. F. Codd, "A relational model for large shared data banks", Communications of the ACM, 1970, 13 (6):377 ～ 387.
2[2]L. A. Zadeh, "Fuzzy sets", Information and Control, vol. 8, pp. 338 - 353, 1965.
3[3]J. F. Baldwin and S. Q, Zhou, "A fuzzy relational inference language", Fuzzy Sets and Systems, 1984, 14:155 ～ 174.
4[4]B. P. Buckles and F. E. Petry, "A fuzzy representation of data for relational databases", Fuzzy Sets and Systems, 1982, 7:213 ～ 226.
5[5]H. Prade and C. Testemale, "Generalizing database relational algebra for the treatment of incomplete or uncertain information and vague queries", Information Sciences, 1984, 34:115 ～ 143.
6[6]E. A. Rundensteiner, L. W. Hawkes and W. Bandler, "On nearness measures in fuzzy relational data models", International Journal of Approximate Reasoning, 1989, 3:267 ～ 298.
7[7]G. Q. Chen, J. Vandenbulcke and E. E. Kerre, "A step towards the theory of fuzzy relational database design", Proceedings of IFSA'91 World Congress, 1991:44 ～ 47.
8[8]D. Dubios, H. Prade, The three semantics of fuzzy sets, Fuzzy sets and systems, 1997:141 ～ 150.
9[9]R.R. Yager, On order weighted averaging aggregation operators in multicriteria decisionmaking, IEEE Transactions on Systems, Man and Cybernetics, 1988, 18:183 ～ 190.
10[10]R.R. Yager, Implementing quotient operators in fuzzy databases using OWA operators, Fuzziness in database management systems, 1995:186 ～ 206.

模糊系统与数学

2004年第z1期

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