对于系统逻辑结构设计的任务，是将系统的概念结构设计阶段所设计好的概念模

For mission system logical structure design, the good is the conceptual model (ER FIG) design concept design stage of the system, translating into a user selected the DBMS (database management system), the data model can be supported matches Database Design. <br>The core bus line query system database, the system's data sheet. Database storage structures and access methods in the physical device, the physical structure of the main part of a part of the design of the database, this stage is given for each logical model, selecting one of the most if Yi and best meet the requirements for the physical storage the design process.

For the task of system logical structure design, the concept model (E-R diagram) designed during the conceptual structure design phase of the system is successfully transformed into the DBMS (database management system) selected by the user, and the database design can be supported by the data model.<br>The core of the bus line query system database is the system's data table. The storage structure and access method of the database on the physical device mainly belong to the physical structure design part of the database, this stage is mainly for each given logical model, choose the most pleasant and most compliant physical storage procedure design.

The task of logical structure design of the system is to transform the conceptual model (E-R diagram) designed in the conceptual structure design stage of the system into the DBMS (database management system) selected by the user, which can support the database design matching the data model.<br>The core of the database of public transport line query system is the data table of the system. The storage structure and access method of the database on the physical device mainly belong to the physical structure design part of the database. This stage is mainly to select a most comfortable and satisfactory physical storage process design for each given logical model.