| Data Dependencies in Database with Incomplete Information |
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| 作者姓名： | Zhang Yan He Jichao |
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| 作者单位： | Nanjing Institute of Technology，Nanjing Institute of Technology |
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| 摘 要： | To get more meaning of incomplete information,a predicate way is proposed torepresent the nulls.The concepts of functional and multivalued dependencies areextended in the environment which allows nulls in a database relation.The inferencerules which can be applied to the extended dependencies are investigated.Finally it isshown that the rules are complete for the family of extended functional and multivalueddependencies.
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Data dependencies in database with incomplete information |
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| Zhang Yan,He Jichao.Data Dependencies in Database with Incomplete Information[J].Journal of Computer Science and Technology,1988,3(2):131-138. |
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| Authors: | Yan Zhang Jichao He |
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| Affiliation: | Nanjing Institute of Technology; |
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| Abstract: | To get more meaning of incomplete information, a predicate way is proposed to represent the nulls. The concepts of functional and multivalued dependencies are extended in the environment which allows nulls in a database relation. The inference rules which can be applied to the extended dependencies are investigated. Finally it is shown that the rules are complete for the family of extended functional and multivalued dependencies. |
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