| 全序时态候选关键字问题初步研究 |
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| 引用本文： | 万静,刘美杨,郝忠孝.全序时态候选关键字问题初步研究[J].自动化技术与应用,2011,30(5):26-30,34. |
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| 作者姓名： | 万静 刘美杨 郝忠孝 |
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| 作者单位： | 哈尔滨理工大学计算机科学与技术学院,黑龙江哈尔滨,10008 |
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| 摘 要： | 与时间相关的数据库应用需求的不断增长,使得时态数据库设计成为非常重要的问题.在数据库的设计中,要充分考虑对数据依赖的处理.数据依赖是数据库设计理论中的一个核心概念,通过它可以规范属性之间满足的固有的语义约束.为了更有效的研究时态数据库中各种依赖以及各属性之间的关系,以便将进一步规范化,本文提出了全序时态左部属性、全序时...
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| 关 键 词： | 全序时态候选关键字 全序时态左部属性 全序时态右部属性 全序时态模块模式 |
The Preliminary Research of Total Order Temporal Candidate Key Issues |
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| WAN Jing,LIU Mei-yang,HAO Zhong-xiao.The Preliminary Research of Total Order Temporal Candidate Key Issues[J].Techniques of Automation and Applications,2011,30(5):26-30,34. |
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| Authors: | WAN Jing LIU Mei-yang HAO Zhong-xiao |
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| Affiliation: | WAN Jing,LIU Mei-yang,HAO Zhong-xiao(College of Computer Science and Technology,Harbin University of Science and Technology,Harbin 150080 China) |
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| Abstract: | The ever increasing of database related to time makes designing temporal database very important.In the design of temporal database,it is necessary to give full consideration to the data dependent treatment.Data dependency is a central notion in database design theory through which intrinsic semantic restriction among attributes can be normalized.In order to make the study,the relation of all the dependences and all the attributes,more efficient,then normalize one more step,in this paper,the notions of tota... |
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| Keywords: | sets is given use replacement method its correctness are proved Key words: total order temporal candidate keys total order temporal left attributes total order temporal right attributes total order temporal module schemes |
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