通过实例来学习,本教程将通过实例来补充说明解释。查看所有 SQL 示例SQL 测试在W3Schools 测试您的 SQL 技能!开始SQL 测验!SQL 参考手册SQL 关键字参考MYSQL 函数SQLServer 函数MS Access 函数SQL 快速参考SQL 数据类型Microsoft Access、MySQL 和 SQL Server 的数据类型和范围。
« W3Schools Home Next Chapter » SQL SQL is a standard language for accessing databases. Our SQL tutorial will teach you how to use SQL to access and manipulate data in: MySQL, SQL Server, Access, Oracle, Sybase, DB2, and other database systems....
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SQL脚本是一种用于操作和管理关系型数据库的脚本语言。W3Schools是一个提供在线学习编程和开发技术的教育平台,其中包含了关于SQL脚本的简单教程和示例。 当W3Schools中的简单SQL脚本不起作用时,可能有以下几个可能的原因和解决方案: 数据库连接问题:请确保数据库连接的凭据和连接字符串是正确的,包括数据库的主机地址、...
当W3Schools中的简单SQL脚本不起作用时,可能有以下几个可能的原因和解决方案: 数据库连接问题:请确保数据库连接的凭据和连接字符串是正确的,包括数据库的主机地址、用户名、密码等。可以通过测试连接来验证连接是否成功。 数据库权限问题:请确保数据库用户具有执行SQL脚本的权限。有些数据库管理系统可能需要特定的权限...
W3Schools SQL Quiz W3SchoolsSQL Quiz SQL QUIZPoints: 25 out of 25 1. What does SQL stand for? You answered: Structured Query Language Correct Answer! 2. Which SQL statement is used to extract data from a database? You answered: SELECT...
Test your SQL skills at W3Schools! My Learning Track your progress with the free "My Learning" program here at W3Schools. Log in to your account, and start earning points! This is an optional feature. You can study at W3Schools without using My Learning. ...
Test your SQL skills at W3Schools! My Learning Track your progress with the free "My Learning" program here at W3Schools. Log in to your account, and start earning points! This is an optional feature. You can study at W3Schools without using My Learning. ...
3.W3Schools（老牌学习站点）网址：https://www.w3schools.com/sql/ 推荐原因：以简洁明了的方式介绍...
SQL Quick Reference From W3Schools SQL StatementSyntax AND / OR SELECT column_name(s)FROM table_nameWHERE conditionAND|OR condition ALTER TABLE ALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name DROP COLUMN column_name AS (alias) SELECT column_name AS column_aliasFROM...