五,逻辑数据模型设计(logical data model)
name physicaldatamodel_1 code physicaldatamodel_1 dbms sybase
概念数据模型(conceptual data model,简写cdm),简称概念模型,是面向
in this model, data is organised in two-dimensionaltablesand the
3,物理数据模型(physical data model):简称物理模型,是面向计算机
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