【摘要】 在数据库设计中,关系模式的规范化过程是通过对关系模式的分解来实现的。把低一级的关系模式分解为若干个高一级的关系模式,这种分解不是唯一的。逻辑数据库设计主要是以关系规范化理论为基础,分析关系模式中的数据依赖,通过投影分解,消除不合理的数据依赖。对基于函数依赖的关系模式的分解方法进行了分析。更多还原

【Abstract】 In the design of the data base,the normalization course of relationship mode is achieved by the resolution of relationship mode.The lower grade relationship mode can be divided into several higher grade modes,but this is not the only resolution.The design of logic data base, mainly based on the relationship normalization course theory,finds out the base dependence and eliminates the unreasonable data dependence by projection resolution method.Resolution method of relationship mode based on the function dependence is analyzed.更多还原