数据库设置外键
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MySQL数据库中外键(foreign key)用法详解
目录前言一、外键作用及其限制条件1 外键的定义2 外键的作用3 外键创建限制二、外键创建方法1 创建外键的语法2 举例（1）创建两张表（2）创建外键（3）查看表结构三、验证外键作用1 先向主表中添加数据2 触发限制使用[详细]
2023-11-20 09:06 分类：数据库 How to detect what Library is behind the $ function?
I am developing some JavaScript that should work with either Prototype.js or JQuery, thus I need some way to i开发者_开发知识库dentify what is the primary library in use. How can I do that?You can che[详细]
2022-12-28 17:23 分类：问答
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