| 关于MicroSQL查询等价的若干定理及查询变换优化策略 |
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| 引用本文： | 王能斌,朱强. 关于MicroSQL查询等价的若干定理及查询变换优化策略[J]. 东南大学学报(自然科学版), 1986, 0(5) |
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| 作者姓名： | 王能斌 朱强 |
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| 作者单位： | 南京工学院计算机科学与工程系，南京工学院计算机科学与工程系 |
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| 摘 要： | Micro SQL是微机关系数据库管理系统NITDB采用的数据语言。为了进行查询优化,本文对Kim W.的思想加以推广,从理论上提出了若干关于Micro SQL查询的等价定理,并把一些结果运用到NITDB中,从而为NITDB提供了一种查询变换优化措施,提高了查询效率。
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| 关 键 词： | 计算机软件 关系数据库 查询语言 查询优化 等价变换 |
Some Theorems Relating to the Equivalence of Micro SQL Query Statements and Optimization via Query Transformation |
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| Wang Nengbin Zhu Qiang. Some Theorems Relating to the Equivalence of Micro SQL Query Statements and Optimization via Query Transformation[J]. Journal of Southeast University(Natural Science Edition), 1986, 0(5) |
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| Authors: | Wang Nengbin Zhu Qiang |
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| Affiliation: | Wang Nengbin Zhu Qiang Department of Computer Science and Engineering |
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| Abstract: | Micro SQL is a data language used in NITDB, a relationai DBMS on microcomputer. In order to optimize queries, some theorems relating to the equivalence of Micro SQL query statements are given in this paper by extending the idea presented in the paper of Kim W. Some of the results have been used in NITDB and an optimization strategy via query transformation was developed in NITDB to make query processing more efficient. |
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| Keywords: | computer software relational database query language query optimization equivalence transformation. |
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