| 用SQL实现关系代数中近似除与关系整除方法的研究 |
| |
| 引用本文： | 钱哨. 用SQL实现关系代数中近似除与关系整除方法的研究[J]. 计算机与现代化, 2010, 0(4): 54-56. DOI: 10.3969/j.issn.1006-2475.2010.04.015 |
| |
| 作者姓名： | 钱哨 |
| |
| 作者单位： | 交通部管理干部学院计算机系,北京,101601 |
| |
| 摘 要： | 关系代数是关系数据库的理论推演代数基础,而SQL是具体实现的标准计算机语言,特别是关系代数之中的除问题,很多情况下仅仅是理论抽象代数形式。本文通过对关系代数的深入剖析,分解为近似除和关系整除,通过实际案例进行关系代数除运算比较和推演,并最终通过SQL实现。
|
| 关 键 词： | 关系代数 SQL 除 |
How to Achieve Approximate Divide and Exact Relation Division in Relational Algebra with SQL |
| |
| QIAN Shao. How to Achieve Approximate Divide and Exact Relation Division in Relational Algebra with SQL[J]. Computer and Modernization, 2010, 0(4): 54-56. DOI: 10.3969/j.issn.1006-2475.2010.04.015 |
| |
| Authors: | QIAN Shao |
| |
| Affiliation: | Department of Computer Science/a>;Transport Management Institute/a>;Ministry of Transport of the People's Republic of China/a>;Beijing 101601/a>;China |
| |
| Abstract: | Relational algebra is based on relational database theory,SQL is a concrete realization of the standard computer language.Particularly,the division problem in relational algebra,that's only the abstract theory problems.This paper analyzes relational algebra in depth,and that is devided two parts: approximate divide and exact relation division.The paper achieves SQL in approximate divide and exact relation division by relational algebra. |
| |
| Keywords: | relational algebra SQL division |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
