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.
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