| 码保持关系模式变换理论 |
| |
| 引用本文： | 周定康. 码保持关系模式变换理论[J]. 计算机学报, 1995, 18(10): 770-776 |
| |
| 作者姓名： | 周定康 |
| |
| 作者单位： | 江西师范大学计算机科学系 |
| |
| 基金项目： | 省重点科技项目,省自然科学基金 |
| |
| 摘 要： | 本文定义了分类属性的六个函数和属性集弱闭包概念，开发了决定双元非主属性的算法；并从变换技术入手，导出了将一个关系模式映射成与之等码的简单关系模式的理论和方法。
|
| 关 键 词： | 数据库 关系模式 候选关键字 关系数据库 |
TRANSFORMATION THEORY OF RELATION SCHEME WITH KEEPING EQUAL CANDIDATE KEYS |
| |
| Zhou Dingkang. TRANSFORMATION THEORY OF RELATION SCHEME WITH KEEPING EQUAL CANDIDATE KEYS[J]. Chinese Journal of Computers, 1995, 18(10): 770-776 |
| |
| Authors: | Zhou Dingkang |
| |
| Abstract: | In this paper,six functions for classifying attributes and conception of weakly closure of attributes is defined.An algorithm for determining both hands no meta attribute is developed.The theory and method which reduces the relation scheme to simple scheme with keeping e.qual candidate keys are studied with transformation technology. |
| |
| Keywords: | Database relation scheme mapping candidate key. |
| 本文献已被 CNKI 维普 等数据库收录！ |
