fuzzy-relation based relational database model 基于模糊关系的关系数据库模型
The paper introduced the basic conception of math of relation database model, N-ple relation, fordered N-ple and fordered sets.
给出了关系数据库模型的数学基本概念，如N元关系、N元有序组及N元有序组集合。
According to the demands, the structure of the database has been designed: defining data, defining table, building relation data model and designing the data structure.
按照任务的目的和要求，设计了其数据库系统结构：定义数据、表、创建数据关系模型及设计数据结构。
On this basis, it emphasized how to establish the node basic information database and the restricting relation database, and constructed out the mathematic model of the planar linkage mechanism.
在此基础上，着重阐述了如何建立结点基本信息数据库和约束关系数据库，从而构造出平面连杆机构的数学模型。
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