| 多环境下空值"NULL"的解析与应用 |
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| 引用本文： | 王汉有,丛政义. 多环境下空值"NULL"的解析与应用[J]. 辽宁省交通高等专科学校学报, 2006, 8(1): 60-62 |
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| 作者姓名： | 王汉有 丛政义 |
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| 作者单位： | 吉林农业工程职业技术学院,吉林,公主岭,136100;辽宁省交通高等专科学校,辽宁,沈阳,110122 |
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| 摘 要： | 本文在多环境下对空值“NULL”的设置、赋值、判断及其编程处理方法进行了讨论和分析,并给出了一些明确的结论和使用建议。这些结论和建议对于数据库维护及有关开发的编程和测试人员,具有较高的参考价值。
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| 关 键 词： | 空值(Null) 多环境 字段属性 |
| 文章编号： | 1008-3812（2006）01-060-03 |
| 收稿时间： | 2006-01-20 |
| 修稿时间： | 2006-01-20 |
The Comprehension And the Application of the Empty Value "NULL" in Multi Environments |
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| Wang Hanyou,Cong Zhengyi. The Comprehension And the Application of the Empty Value "NULL" in Multi Environments[J]. Journal of Liaoning Provincial College of Communications, 2006, 8(1): 60-62 |
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| Authors: | Wang Hanyou Cong Zhengyi |
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| Affiliation: | Wang Hanyou Cong Zhengyi |
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| Abstract: | This text discussed and analyzed the method to set up, to judge and to endow value to the empty value " NULL" and carried out the method to project in multi environments. The author also provides some explicit conclusions and suggestions, which are of higher reference value for database constructing, testing and maintenance. |
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| Keywords: | Empty value (Null) Many environments Property of the field |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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