| 关系模式规范化的几个问题 |
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| 引用本文： | 朱扬勇.关系模式规范化的几个问题[J].新疆大学学报(理工版),1991,8(2):38-41. |
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| 作者姓名： | 朱扬勇 |
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| 作者单位： | 新疆大学计算中心 |
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| 摘 要： | 本文讨论了关系数据库中实际数据依赖和用于规范化的函数依赖集之间的差异及过度规范化问题。研究了函数依赖集的闭包及Boyce-Codd范式的判定问题。提出了原子函数依赖集的概念,以此取代函数依赖集的闭包进行关系模式的规范化。并定义了一类对某NP-完全问题可解的实际问题。
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| 关 键 词： | 关系模式 规范化 关系数据库 闭包 |
SEVERAL PROBLEMS OF RELATIONAL SCHEMA NORMALIZATION |
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| Zhu Yangyong.SEVERAL PROBLEMS OF RELATIONAL SCHEMA NORMALIZATION[J].Journal of Xinjiang University(Science & Engineering),1991,8(2):38-41. |
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| Authors: | Zhu Yangyong |
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| Institution: | Computing Center |
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| Abstract: | This paper discusses the functional dependences of a relational schema and the overnormalization The closure of functional dependence's set and the decission of Boyce-Codd normal form are studied Atomic functional dependence and a class of relational schema which has feasible argrithm for it's NP-complete problem are defined. |
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| Keywords: | relational database normalization closure functional dependence Boyce-Codd normal form |
| 本文献已被 CNKI 维普 等数据库收录！ |
