relational model of database

This paper takes XML as a public model and studies the conversion technology among heterogeneous relational database systems by means of reversible conversion between relational and XML, and this process keep on entity integrity constraints of source database.

所以本文研究以XML为公共模型，通过关系数据库与XML的可逆双向转换，建立异构关系数据源的统一转换工具。转换过程保留关系数据库的完整性约束。

The application of relational database model to a pest database of afforestation

关系模型在绿化植物有害生物数据库中的应用

Web database and knowledge base standard of mineral processing were built, and traditional rule, frame, semantic model and predicate logic knowledge were characterized by relational data pattern.

构造了选矿基础Web数据库，建立了统一的知识库标准，基于关系模式表征了传统的规则、框架、语义网络、谓词逻辑等知识；

By means of extended relational database model, a view-based framework of constructing spatio-temporal data model is proposed to integrate the attribute of time and space.

通过扩展关系型数据模型，提出一种基于视图的时空数据模型构造方法，实现空间属性和时间属性一体化。

First of all, this paper investigates research status of fuzzy relational database and properties of vague set, and then puts forward a generalized fuzzy relational data model on vague set ( VGFRDM) and a fuzzy database structured query language on vague set ( VFSQL).

本文首先探讨了模糊关系数据库的研究现状和Vague集的性质，然后提出了基于Vague集的广义模糊关系数据模型VGFRDM和基于Vague集的模糊数据库查询语言VFSQL。

Conversion from Object Model to Relational Model of Database

从对象模型到数据库关系模型的转换