| 空值数据库查询中的集合差、联接运算及一致性 |
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| 引用本文： | 郝忠孝,胡春海.空值数据库查询中的集合差、联接运算及一致性[J].燕山大学学报,1995(3). |
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| 作者姓名： | 郝忠孝 胡春海 |
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| 作者单位： | 自动控制系 |
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| 摘 要： | 在三种不同操作：ＤＥＦＩＮＩＴＥ．ＥＸＩＳＴ．ＭＡＹＢＥ的基础上．给出了含有这三种操作的集合差、一般联接运算的新定义．讨论了三种操作的一致性问题．
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| 关 键 词： | 空值，集合差，联接，一致性 |
Rulls and the Algorithen of Difference and Join for Sets, Consistency in inquiry to Relational Database Under Null Value |
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| Hao Zhongxiao, Hu Chunhai.Rulls and the Algorithen of Difference and Join for Sets, Consistency in inquiry to Relational Database Under Null Value[J].Journal of Yanshan University,1995(3). |
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| Authors: | Hao Zhongxiao Hu Chunhai |
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| Institution: | Dept. of Auto. |
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| Abstract: | On the basis of three differation operation(DEFINITE. EXIST.MAYBE. new definition of difference and general join contaning these operationsare given. Problems of consistency to these operations are discussed. |
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| Keywords: | null sets difference join consistency |
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