| 含有空值的多值依赖强保持条件的进一步研究 |
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| 引用本文： | 刘国华 郝忠孝. 含有空值的多值依赖强保持条件的进一步研究[J]. 计算机研究与发展, 1994, 31(6): 1-5 |
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| 作者姓名： | 刘国华 郝忠孝 |
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| 作者单位： | 东北重型机械学院 |
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| 摘 要： | 本文对含有空值的多值依赖的强保持条件进行深入讨论，对文［１］，［２］中的相应概念做了根本的修正，提出了新的含有空值的多值依赖强保持条件，论证了它的正确性，从而为进一步讨论不完全关系的应用提供了一个可靠的条件。
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| 关 键 词： | 空值 多值依赖 关系模式 数据库 |
A Further Study of Strong Hold Conditions of Multivalued Dependencies With Null Values |
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| Liu Guohua and Hao Zhongxiao. A Further Study of Strong Hold Conditions of Multivalued Dependencies With Null Values[J]. Journal of Computer Research and Development, 1994, 31(6): 1-5 |
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| Authors: | Liu Guohua and Hao Zhongxiao |
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| Abstract: | In this paper, strong hold condition of multivalue dependencies with null value is discussed deeply, and the corresponding concepts in literature [1] and [2] are modified fundamentally.New strong hold condition of multivalue with null value is presented, and its validity is proved. |
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| Keywords: | Null value incomplete relation multivalue dependency strong hold relation schema. |
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