Data Modeling Technologies - ER, IE, Barker, IDEF1X, EXPRES-G, ORM
DataModelingTechnologies-ER,IE,Barker,IDEF1X,EXPRES-G,ORMEntityRelationshipModel-ER模型-实体关系模型1976年PeterChen首次提出了EntityRelationshipModeling(实体关系建模)概念,并发明了陈氏表示法PeterChen'sNotation,因此ER模型也可以叫做Chen'sModel(