| Extending the Relational Model to Deal with Probabilistic Data |
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| 作者姓名： | MA Zongmin ZHANG W. J MA W. Y |
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| 作者单位： | [1]CityUniversityofHongKong,Kowloon,HongKong,P.R.China [2]UniversityofSaskatchewan,Saskatoon,Canada |
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| 摘 要： | According to the soundness and completeness of information in databases,the expressive form and the semantics of incomplete information are discussed in this paper.On the basis of the discussion,the current studies on incomplete data in relational databases are reviewed.In order to represent stochastic uncertainty in most general sense in the real world,probabilistic data are introduced into relational databases.An extended relational data model is presented to express and manipulate probabilistic data and the operations in relational algebra based on the extended model are defined in this paper.
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| 关 键 词： | 关系数据库 关系模型 概率性数据 |
Extending the relational model to deal with probabilistic data |
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| MA Zongmin,ZHANG W. J,MA W. Y.Extending the Relational Model to Deal with Probabilistic Data[J].Journal of Computer Science and Technology,2000,15(3):230-240. |
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| Authors: | Zongmin Ma W J Zhang W Y Ma |
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| Affiliation: | (1) City University of Hong Kong, Kowloon, Hong Kong, P.R. China;(2) University of Saskatchewan, Saskatoon, Canada |
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| Abstract: | According to the soundness and completeness of information in databases, the expressive form and the semantics of incomplete information are discussed in this paper. On the basis of the discussion, the current studies on incomplete data in relational databases are reviewed. In order to represent stochastic uncertainty in most general sense in the real world, probabilistic data are introduced into relational databases. An extended relational data model is presented to express and manipulate probabilistic data and the operations in relational algebra based on the extended model are defined in this paper. |
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| Keywords: | incomplete information uncertain information extended relational model probabilistic data relational algebra |
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