摘要
存在连接依赖的数据库会引入数据冗余,然而在实际数据库的设计和维护中,无法根据其定义判断是否存在连接依赖。数据依赖是数据间现实语义约束的一个反映,是属于语义范畴的,它的确定也是基于数据所蕴含的语义规则[2]。结合实例,通过分析数据蕴含的语义,讨论确定连接依赖的一般思路和方法,对数据挖掘、提高数据质量有理论参考价值。
The join dependency in database can bring about data redundancy, but in the actual database design and maintenance, it is not realistic to determine whether there is join dependency according to the definition of the concept. The data dependency reflects the realistic semantic constraints between different data＇s items, belongs to the semantic areas. And finding the correct data dependency is also based on the semantic rules contained in data. This article discusses the general ideas and methods of finding the correct join dependency by some instances. The work has the theory reference value for the data mining and promoting data quality.
出处
《计算机与现代化》
2009年第12期72-74,共3页
Computer and Modernization
