| Now相关概率不确定时态数据模型 |
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| 引用本文： | 周汉达.Now相关概率不确定时态数据模型[J].嘉应学院学报,2009,27(6):29-32. |
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| 作者姓名： | 周汉达 |
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| 作者单位： | 嘉应学院,计算机学院,广东,梅州,514015 |
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| 摘 要： | 时间是自然界无所不在的客观属性,随着数据库技术的发展,时态信息在数据库系统中的作用日益重要。本文描述了有效时间与不确定性等概念,分析了概率不确定时态数据模型,引入时态变量,提出一种新的时态信息模型,并简单讨论了在此数据模型上的时态关系演算。
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| 关 键 词： | 时态数据模型 不确定性 变量 概率 |
NOW Related-probability Based Indeterminate Temporal Data Model |
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| ZHOU Han-da.NOW Related-probability Based Indeterminate Temporal Data Model[J].Journal of Jiaying University,2009,27(6):29-32. |
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| Authors: | ZHOU Han-da |
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| Institution: | ZHOU Hart - da (School of Computer Science, Jiaying University, Meizhou 514015, China) |
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| Abstract: | Everything has its time attribute. At the beginning, we discuss the concept of Valid Time and Inde- terminacy, analyze the probability-based indeterminate temporal data model in depth, and introduce an important variable called NOW, then a model named ＂NOW related - probability - based indeterminate temporal data model＂ will be built. Finally, we discuss the relational calculus based on this model. |
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| Keywords: | temporal data model indeterminacy variable probability |
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