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E-R称为实体-联系图，是描述概念世界、建立概念模型的实用工具。数据库的设计过程是先使用E-R图描述组织模式，再进一步转换成任何一种DBMS支持的数据模型。E-R图的三要素为实体、属性和联系，分别用矩形框、椭圆形和菱形框表示。 [2] (责任编辑：) |
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E-R称为实体-联系图，是描述概念世界、建立概念模型的实用工具。数据库的设计过程是先使用E-R图描述组织模式，再进一步转换成任何一种DBMS支持的数据模型。E-R图的三要素为实体、属性和联系，分别用矩形框、椭圆形和菱形框表示。 [2] (责任编辑：) |
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