数据库的逻辑结构设计数据库逻辑结构的设计可以分为三个阶段，即：用户需求

数据库的逻辑结构设计数据库逻辑结构的设计可以分为三个阶段，即：用户需求，E-R模型的建立以及数据库模型的设计。在数据库逻辑设计的第一阶段，将按照以下四个步骤来进行用户需求的收集或分析：分析用户活动，确定系统范围以及分析用户活动对数据的影响。建立E-R模型的逻辑设计的第二阶段分为两个步骤。首先，应进行部分E-R模型设计，然后再进行整体E-R模型设计。逻辑设计的第三阶段在数据库模式设计阶段分两个步骤执行。第一步是初步设计，它将E-R图转换为关系模型，第二步是优化设计以调整和改进模型。

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结果 (英语) 1: [复制]

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The design of the logical structure of the database The design of the logical structure of the database can be divided into three stages, namely: user needs, the establishment of the ER model and the design of the database model. In the first stage of the database logic design, user needs will be collected or analyzed in the following four steps: analyzing user activities, determining the system scope, and analyzing the impact of user activities on data. The second stage of establishing the logical design of the ER model is divided into two steps. First, part of the ER model design should be carried out, and then the overall ER model design should be carried out. The third stage of logic design is implemented in two steps in the database schema design stage. The first step is the preliminary design, which converts the ER diagram into a relational model, and the second step is to optimize the design to adjust and improve the model.

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结果 (英语) 2:[复制]

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The logical structure design of the database The design of database logical structure can be divided into three stages, namely: user requirements, the establishment of E-R model and the design of database model. In the first phase of database logic design, the collection or analysis of user requirements is performed in four steps: analyzing user activity, determining system scope, and analyzing the impact of user activity on data. The second stage of the logical design of the E-R model is divided into two steps. First, part of the E-R model design should be carried out, and then the overall E-R model design should be carried out. The third phase of logical design is performed in two steps in the database pattern design phase. The first step is preliminary design, which converts the E-R diagram into a relational model, and the second step is to optimize the design to adjust and improve the model.

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结果 (英语) 3:[复制]

复制成功！

Logical structure design of database The design of the logical structure of the database can be divided into three stages: user requirements, the establishment of E-R model and the design of the database model. In the first stage of database logic design, the following four steps will be followed to collect or analyze user requirements: analyzing user activities, determining the scope of the system and analyzing the impact of user activities on data. The second stage of logic design of E-R model is divided into two steps. First, we should design part of the E-R model, and then the whole E-R model. The third stage of logic design is divided into two steps in the database schema design stage. The first step is the preliminary design, which transforms the E-R diagram into a relational model. The second step is to optimize the design to adjust and improve the model.

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