1. Sqlite

  • 1.1. SQLite tutorial

    SQLite is a software library that implements a self-sufficient, serverless, zero-configuration, transactional SQL datab...
    2025-10-25 13:32:47 UTC
  • 1.2. Introduction to SQLite

    This tutorial helps you understand what SQLite is, how it differs from SQL, why it is needed, and how its application databa...
    2025-10-25 13:32:43 UTC
  • 1.3. SQLite installation

    An important feature of SQLite is zero configuration, which means that there is no need for complex installation or manageme...
    2025-10-25 13:32:41 UTC
  • 1.4. SQLite command

    This chapter will show you the simple but useful commands used by SQLite programmers. These commands are called SQLite dot c...
    2025-10-25 13:32:45 UTC
  • 1.5. SQLite syntax

    SQLite follows a unique set of rules and guidelines called grammar. This tutorial lists all the basic SQLite syntax and prov...
    2025-10-25 13:32:42 UTC
  • 1.6. SQLite data type

    The SQLite data type is a property that specifies the data type of any object. Every column, variable, and expression in SQL...
    2025-10-25 13:32:41 UTC
  • 1.7. SQLite creates a database

    SQLite’s sqlite3 Command is used to create a new SQLite database. You do not need any special permissions to create a data...
    2025-10-25 13:32:45 UTC
  • 1.8. SQLite attached database

    Suppose that when multiple databases are available at the same time, you want to use any of them. SQLite’s ATTACH DATABASE ...
    2025-10-25 13:32:42 UTC
  • 1.9. SQLite detach database

    SQLite’s DETACH DATABASE Statement is used to separate and detach a named database from a database connection, which was p...
    2025-10-25 13:32:47 UTC
  • 1.10. SQLite create table

    SQLite’s CREATE TABLE Statement is used to create a new table in any given database. Creating a basic table involves namin...
    2025-10-25 13:32:46 UTC
  • 1.11. SQLite delete table

    SQLite’s DROP TABLE Statement is used to delete the table definition and all related data, indexes, triggers, constraints,...
    2025-10-25 13:32:46 UTC
  • 1.13. SQLite Select statement

    SQLite’s SELECT Statement is used to get data from an SQLite database table and return it as a result table. These result ...
    2025-10-25 13:32:44 UTC
  • 1.14. SQLite operator

    1.14.1. What is the SQLite operator? ¶ Operator is a reserved word or character that is used primarily for SQLite ...
    2025-10-25 13:32:46 UTC
  • 1.16. SQLite Where clause

    SQLite’s WHERE Clause is used to specify the conditions for getting data from one or more tables. Returns a specific val...
    2025-10-25 13:32:44 UTC
  • 1.17. SQLite AND/OR operator

    SQLite Of AND And OR Operator is used to compile multiple conditions to narrow down the SQLite The data selected...
    2025-10-25 13:32:47 UTC
  • 1.18. SQLite Update statement

    SQLite Of UPDATE The query is used to modify existing records in the table. You can use the WHERE Clause to update...
    2025-10-25 13:32:43 UTC
《地理信息系统原理、技术与方法》  97

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。