The weak and strong holds of Full Functional Dependencies and Part Functional Dependencies under the null values environment are proposed in this paper.
本文给出了空值环境下的完全函数依赖的弱保持、强保持及部分函数依赖。
The weak and strong holds of Full Functional Dependencies and Part Functional Dependencies under the null values environment are proposed in this paper.
本文给出了空值环境下的完全函数依赖的弱保持、强保持及部分函数依赖。
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