| 次协调数据库中的域关系演算 |
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| 引用本文： | 应毅.次协调数据库中的域关系演算[J].微计算机信息,2012(1):181-183,180. |
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| 作者姓名： | 应毅 |
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| 作者单位： | 三江学院计算机科学与工程学院 |
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| 摘 要： | 次协调数据库的数据模型是用来处理数据库中两类不确定信息,即不完全信息和不一致信息(矛盾信息)。关系演算语言是表达关系数据模型中的数据操作的一种方式。域关系演算是以域为变量进行的关系演算。文中提出了一种4值的域关系演算来查询次协调数据库,它的语法与普通关系上的2值域关系演算相似,但是这种新的4值语义能够有效的查询不完全信息和不一致信息。这为次协调数据库中的类SQL语言及实现提供了理论依据,进而为次协调数据库的应用打下坚实基础。
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| 关 键 词： | 次协调数据库 4值逻辑 域关系演算 |
Domain Relational Calculus for Paraconsistent Database |
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| YING Yi.Domain Relational Calculus for Paraconsistent Database[J].Control & Automation,2012(1):181-183,180. |
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| Authors: | YING Yi |
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| Affiliation: | YING Yi(College of Computer Science and Technology,Sanjiang University,Nanjing 210012,China) |
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| Abstract: | Paraconsistent database is introduced to manipulate two kinds of uncertain information in database:incomplete and inconsistent.Relational calculus language is one way to express the operation of relational data mode1.Domain relational calculus bases on the variable of domain.In this paper,we present a 4-valued domain relational calculus for posing queries to paraconsistent databases based on that model.The syntax of our calculus is similar to that of the regular 2-valued relational calculus on ordinary relational databases,but our new 4-valued semantics makes it a useful querying tool for applications containing incomplete and inconsistent information.These results help establish the application of paraconsistent database. |
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| Keywords: | paraconsistent database four-valued logic domain relational calculus |
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