安徽农业科学2012，Vol.40Issue(8)：4467-4468,4472,3.
数据依赖中传递函数依赖的研究与探讨
Research and Discussion of Transitive Functional Dependency in the Data Dependency
摘要
Abstract
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.关键词
数据依赖/函数依赖/部分函数依赖/传递函数依赖/候选码Key words
Data dependency/ Functional dependency/ Partial functional dependency/ Transitive functional dependency/ Candidate key分类
农业科技引用本文复制引用
吕俊亚,卢植衡..数据依赖中传递函数依赖的研究与探讨[J].安徽农业科学,2012,40(8):4467-4468,4472,3.
