After the analysis of system function and business, this paper designs the database E-R model and logical data model of this system.

在分析了系统业务和功能之后，设计了系统数据库的E - R模型及逻辑数据库模型。

youdao

After the analysis of system function and business, this paper designs the database E-R model and logical data model of this system.

在分析了系统业务和功能之后，设计了系统数据库的E - R模型及逻辑数据库模型。

youdao