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《Journal of Anhui Agricultural Sciences》 2012-08
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Research and Discussion of Transitive Functional Dependency in the Data Dependency

LV Jun-ya et al(Henan University of Economics and Law,Zhengzhou,Henan 450002)  
Data dependency is the core of the theory of relational data and it is the key to relationship mode decomposition.The concept of the code,the candidate code,the main property,the non-primary attributes and the data dependence were introduced.It was also described that data dependence is important to the normalization.The transfer dependence was analyzed from different perspectives including data dependent nature and the first paradigm to the fifth paradigm.At the same time,the concept of the transfer of data that is used on the current main principles of database systems was analyzed and an accurate definition of transfer data dependent.Finally,the view that some of the dependency is a special one of the transfer dependence was put forward and demonstrated.
【CateGory Index】: TP311.13
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