Manipulations like this (backed by the proper relational theory) are at the heart of database query optimizers. The resulting tree is shown in Figure 2.
此类操作(由恰当的关系理论作为支持)是数据库查询优化器的核心所在。
The relational standardization theory is the relational database development and the design important part.
关系规范化理论是关系数据库开发与设计的重要部分。
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。
Rough relational database model is Multi-valued information system essentially, inheriting and extending classical rough sets theory. But there is much difference between them.
粗糙关系数据库模型从本质上来说就是多值信息系统，它继承和扩展了经典的粗糙集理论，但与经典粗糙集理论又有着很大的不同。
Next, referring to the theory of relational database with incomplete information, the concept of incomplete information is brought in XML document.
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。
In the application of the aforementioned theory, the design of database 's system model on DSS is elaborated, including data modeling, the choice and realization of relational database.
在实际应用中，详细论述了采用前述的建模方法进行决策支持系统数据仓库层模型的设计，包括数据建模、关系数据库选择及实现。
The functional dependency theory has a great influence over the design and application of relational database.
FD理论对于关系数据库的设计和应用产生了深刻的影响。
Then using the theory of relational database to design and create the system-related databases;
然后引入关系数据库相关理论设计并建立系统数据库；
The introduction of approximate theory of rough functional dependency will accelerate the development of knowledge discovery for rough relational database and extend its research field.
该度量的提出及其性质的研究有利于粗糙关系数据库的知识发现及数据查询的研究，并且进一步扩大了粗糙关系数据库的研究领域。
The introduction of approximate theory of rough functional dependency will accelerate the development of knowledge discovery for rough relational database and extend its research field.
该度量的提出及其性质的研究有利于粗糙关系数据库的知识发现及数据查询的研究，并且进一步扩大了粗糙关系数据库的研究领域。
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