摘要： 本文对文献[1]中满足一定条件的关系模式5NF的判定方法进行了分析,通过对无损连接分解的若干性质的研究中,得出了关於5NF判定的相关判定法.

关键词: 关系模式, 无损连接, 关系数据库

Abstract: The paper makes an analysis of the 5NF judgement methods which are given in[l] That satisfy ceetain condition in relation scheme.By investigating some qualities of decomposition with a loseless join, we de-rive corresponding counterparts from the of 5NF judgement methods.