In this paper, the tenable condition of the strong and weak holding of join dependency under null value circumstances and the relevant theorems are discussed.
本文在空值环境下的NFD，NMVD强、弱保持条件及相应的推导公理的基础上，讨论了空值环境下的连接依赖的强、弱保持成立的条件及相应的定理。
参考来源 - 空值环境下的NJD及其推导规则的研究 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Fuzzy null embedded join dependency is defined.
定义了模糊空值嵌入连接依赖。
The axiom of fuzzy null value join dependency is introduced and its availability is proved.
给出模糊空值连接依赖的公理系统，并且进行了有效性证明。
Join dependency in relational data theory is not seldom seen during database systems designing.
本文阐明关系数据规范理论中的连接依赖在设计数据库系统时并不少见。
应用推荐