变化的业务需求不断地要求向关系数据模型或面向对象模型中添加新实体和关系。
From time to time, the demands of changing business needs require that you add new entities and relationships to the relational data models or object-oriented models.
本文通过扩展关系数据模型,形成了实体依赖关系数据模型,适用于组织有直接调用关系的模型或方法所组成的模型库或方法库。
This paper extends relational schema and then forms the entity-dependent relational schema, which can be used to organize model bases or method bases.
这是个图形化的数据建模工具,可创建使用关系数据库的实体-关系数据模型。
A graphical data modeling tool, allowing one to build Entity-Relation data models for use with Relational Databases (RDBMS).
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