| DATALOG与关系代数 |
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| 引用本文： | 董玉萍.DATALOG与关系代数[J].计算机应用与软件,2002,19(9):54-56. |
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| 作者姓名： | 董玉萍 |
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| 作者单位： | 广州美术学院计算机中心,广州,510261 |
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| 摘 要： | 本文旨在通过描述DATALOG和关系代数的概念，以及DATALOG与关系代数的区别，经过从关系代数到逻辑规则和从逻辑到关系的论述，并比较DATALOG和关系代数，说明DATALOG是一种基于逻辑的数据模型，是PROLOG语言的数据库版本，关系代数是过程化的语言，关系代数表达式与安全、非递归、带有非操作的DATALOG程序的表达能力是相同的。
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| 关 键 词： | DATALOG 关系代数 数据库 数据模型 过程语言 |
ON DATALOG AND RELATIONAL ALGEBRA |
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| Dong Yupmg.ON DATALOG AND RELATIONAL ALGEBRA[J].Computer Applications and Software,2002,19(9):54-56. |
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| Authors: | Dong Yupmg |
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| Abstract: | In the first place of this paper, the concepts of DATALOG and relational algebra, as well as the difference between the two are described.The relational algebra and the logical rule from logic to relation are discussed. By comparison, it illuminates that DATALOG is a data model based on logic,and is also a database version of PROLOG language. Relational algebra is a process language, whose expression is the same with the DATALOG program on security,nonrecursion and having blame operation. |
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| Keywords: | DATALOG Relational algebra Extension database EDB Intension database IDB Process language |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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