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ER图历史 ER模型最早由Peter Chen于1976年提出它在数据库设计领域得到了广泛的认同但很少用作实际数据库管理系统的数据模型即使对SXL-92数据库来说设计好的数据库也是具有挑战性的它们可以在许多关于数据库设计的文献中找到比如Toby Teorsey 的著作(1994 ) 大部分数据库设计产品使用实体-联系模型(ER模型)帮助用户进行数据库设计ER数据库设计工具提供了一个方框与箭头
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Chapter 7:Entity-Relationship ModelChapter 7:Entity-Relationship ModelDesign ProcessModelingConstraintsE-R Diagram Design Issues Weak Entity Sets Extended E-R FeaturesDesign of the Bank DatabaseReduct
Chapter 6:Entity-Relationship ModelChapter 6:Entity-Relationship ModelDesign ProcessModelingConstraintsE-R Diagram Design Issues Weak Entity Sets Extended E-R FeaturesDesign of the Bank DatabaseReduct
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