关系模式分解合成法的进一步研究

The Syntheses of the Decomposition of Relational Schema: A Further Study

摘要: 本文对关系模式分解的合成法进行了较为深入的研究。提出了用合成法把关系模式转化为BCNF,4NF,5NF,并且“保持函数依赖”和具有“无损联结性”分解的条件。

Abstract: In this paper, the syntheses of the decomposition of relational schema is studied more deeply. The condition that relational schema is enanged into BCNF, 4NF, 5NF by the syntheses, and has "the preservation of FDs" and "lossless join" is mentioned.