摘要
讨论了满足ＴＮＦ的历史关系模式存在的问题并在此基础上，提出２ＴＮＦ概念，给出了达到２ＴＮＦ的模式分解算法，解决了满足ＴＮＦ的历史关系模式所存在的数据存储冗余、更新异常等问题。
The paper mainly discusses the problem of the TNF his- torical relational schemes, and then, gives out the concept of 2TNF and the algorithm on the decomposition of schemes got to 2TNF. This solves the problem of TNF historical relational schemes such as data redundancy, updated alnormal and so on.
出处
《燕山大学学报》
CAS
2000年第1期49-51,共3页
Journal of Yanshan University
关键词
历史关系模式
2TNF
模式分解
更新异常
数据库
historical relational scheme, 2TNF, the decomposition of schemes, update abnormal
