In the design of the database is given in the database E-R diagram and database logical structure.

在数据库的设计中给出了数据库e - R图和数据库的逻辑结构。

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The design of space-database went through concept design, logical design and physical design. This process gave prominence to designing the road and data structure of accidents information.

空间数据库的建立经历了概念设计、逻辑设计、物理设计过程，主要突出了道路、事故信息的数据结构设计。

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The design of space-database went through concept design, logical design and physical design. This process gave prominence to designing the road and data structure of accidents...

空间数据库的建立经历了概念设计、逻辑设计、物理设计过程，主要突出了道路、事故信息的数据结构设计。

youdao

The design of space-database went through concept design, logical design and physical design. This process gave prominence to designing the road and data structure of accidents...

空间数据库的建立经历了概念设计、逻辑设计、物理设计过程，主要突出了道路、事故信息的数据结构设计。

youdao