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A Vague Relational Model and Algebra
Faxin Zhao,Z.M. Ma * #,Li Yan
School of Information Science and Engineering,Northeastern University
*Correspondence author
#Submitted by
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Funding: 教育部博士点基金（No.20050145024）
Opened online: 7 August 2007
Accepted by: none
Citation: Faxin Zhao,Z.M. Ma,Li Yan.A Vague Relational Model and Algebra[OL]. [ 7 August 2007] http://en.paper.edu.cn/en_releasepaper/content/14436
 
 
Imprecision and uncertainty in data values are pervasive in real-world environments and have received much attention in the literature. Several methods have been proposed for incorporating uncertain data into relational databases. However, the current approaches have many shortcomings and have not established an acceptable extension of the relational model. In this paper, we propose a consistent extension of the relational model to represent and deal with fuzzy information by means of vague sets. We present a revised relational structure and extend the relational algebra. The extended algebra is shown to be closed and reducible to the fuzzy relational algebra and further to the conventional relational algebra.
Keywords:Vague set, Fuzzy set, Relational data model, Algebra
 
 
 

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