第1章-sqlserver2008数据库技术概述材料
心理教育信息化管理系统
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自下而上：定义每个本地APP应用程序的概念结构，然后根据一定的规则将其集成到全局概念结构中。智慧职教新版
混合策略：自上而下、自下而上相结合，先用前一种方法确定框架，再自下而上设计和组合局部概念。
中小学学科教学资源微课汇总
进行局部抽象，设计局部概念。 将本地概念模型集成到全局概念模型中。 概念结构设计最常用的表达工具是E-R模型，利用E-R模型进行概念设计的步骤如下。 1.3.2概念结构设计1 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