本文还讨论了该公理集合在不完全信息数据库查询优化上的应用。
Furthermore, the application of this axiom set on the query optimization in the incomplete information database is also discussed.
在关系数据库系统的实现中，对不完全信息的处理通常采用三值逻辑。
When a relational database system is implemented, three-valued logic is usually adopted to handle incomplete information.
为了能够表示和处理关系数据库中这种混合类不完全信息，文中最后给出了一种简化的扩展关系模型。
In order to express and process mixed-type incomplete information in relational database, a - simplified expanded relational model is given.
其次，参考含有空值的关系数据库的理论，将不完全信息的概念引入到XML文档。
Next, referring to the theory of relational database with incomplete information, the concept of incomplete information is brought in XML document.
为了实现不完全信息的处理，以关系数据库中空值的完全语义为基础，阐述空值的存在对数据库操作的影响，并给出几种处理空值的方法。
Based on the semantics of null values in relational database, the article analyzes the affection of null values when we operate the database.
MP~M系统是在中介逻辑系统的基础上建立起来的，用于处理数据库中不完全信息的三值逻辑命题演算系统。
MP~M is a 3-valued logic propositional calculus system which is based on the medium logic system, and it is used to deal with the incomplete information in the database.
MP~M系统是在中介逻辑系统的基础上建立起来的，用于处理数据库中不完全信息的三值逻辑命题演算系统。
MP~M is a 3-valued logic propositional calculus system which is based on the medium logic system, and it is used to deal with the incomplete information in the database.
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