最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
MySQL is the most popular relational database management system, and MySQL is one of the best RDBMS (Relational Database Management System: relational database management system) applications in WEB applications.
In this tutorial, you will quickly grasp the basic knowledge of MySQL and easily use the MySQL database. Database (Database) is a warehouse that organizes, stores and manages data according to the data structure. Each database has one or more different API for creating, accessing, managing, searching, and replicating saved data. We can also store data in a file, but it is relatively slow to read and write data in the file. So now we use a relational database management system (RDBMS) to store and manage large amounts of data. The so-called relational database is a database based on the relational model, which deals with the data in the database with the help of mathematical concepts and methods such as set algebra. RDBMS is the characteristics of relational database management system (Relational Database Management System): 1.数据以表格的形式出现 2.每行为各种记录名称 3.每列为记录名称所对应的数据域 4.许多的行和列组成一张表单 5.若干的表单组成database 4.1. What is a database? ¶
4.2. RDBMS terminology ¶