基数为M的时态候选关键字问题研究  

Research on temporal candidate key with cardinality M

作　　者：万静[1] 刘芳[1] 张晓东[1] 

机构地区：[1]哈尔滨理工大学计算机科学与技术学院,哈尔滨150080

出　　处：《计算机应用研究》2015年第3期748-751,763,共5页Application Research of Computers

基　　金：黑龙江省自然科学基金资助项目(F201014);黑龙江省教育厅科学技术研究项目(12511100)

摘　　要：为了更有效地研究时态数据库中各种时态依赖以及各属性之间的关系,对时态候选关键字的求解进行了研究,定义了时态准左部属性、时态准右部属性和时态纯双部属性等概念;结合关系数据库理论给出了时态最大相关块法求时态候选关键字,并对相关理论进行了证明,这对实现时态候选关键字的规范化问题具有重要的推动作用。In order to study various temporal dependencies and the relationship between the various attributes more efficiently in the temporal database, this paper investigated the temporal candidate keywords and firstly proposed the notions of temporal quasi left attributes, temporal quasi right attributes and temporal pure double attributes. It combined with relational database theory, gave the temporal maximum relative block method to obtain the temporal candidate keywords. And it demonstrates the relevant theorems and deductions. This is an important role in promoting the standardization of temporal candidate key.

关 键 词：时态模块模式 时态候选关键字 时态准左部属性 时态准右部属性 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]