| 关系数据规范理论第五范式的缺陷 |
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| 引用本文： | 陈友君. 关系数据规范理论第五范式的缺陷[J]. 计算机工程, 1998, 24(11): 3-6 |
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| 作者姓名： | 陈友君 |
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| 作者单位： | 中国科技大学管理学院,北京,100039 |
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| 摘 要： | 剖析了连续依赖的本质。并提出其产生的条件和处理的方法。指出连续依赖出现在联系关系中，且并不少见。但不能以一组５ＮＦ去替代原关系。否则会丢失信息。必须采用该文提出的方法去处理。
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| 关 键 词： | 数据库 连续依赖 范式 关系数据规范 |
| 修稿时间： | 1998-01-12 |
Defect of Relational Data Normalization Theory 5NF |
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| Chen Youjun. Defect of Relational Data Normalization Theory 5NF[J]. Computer Engineering, 1998, 24(11): 3-6 |
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| Authors: | Chen Youjun |
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| Affiliation: | Institute of Management of the University of Science and Technology of China Beijing 100039 |
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| Abstract: | In this paper the nature of the join dependency is analyzed. and its causing conditions and processing method are presented. It showsthat the join dependency often appears in the relationship of entity-conjoin.However.the relationship cannot be replaced by a set of 5NF.The method presented in this paper must be used .otherwise the information will be lost . |
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| Keywords: | Database Join dependency Normal form Relation |
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