SQL Tutorial
SQL is a standard language for storing, manipulating and retrieving data in databases.
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
Start learning SQL now »示例 in Each Chapter
With our online SQL editor, you can edit the SQL statements, and click on a button to view the result.
Click on the "来试试吧" button to see how it works.
SQL 练习
SQL 示例
Learn by examples! This tutorial supplements all explanations with clarifying examples.
SQL测验 Test
Test your SQL skills at W3Schools!
SQL 参考
At W3Schools you will find a complete reference for keywords and function:
SQL数据类型
Data types and ranges for Microsoft Access, MySQL and SQL Server.