很好的一个CHM格式的SQL教程，我一直在用，挺不错的-A very good SQL tutorial CHM format, I have been using, very good

MySql教程.chm SQL教程电子书 包括mysql安装 语法等-MySql tutorial. Chm SQL tutorial eBook including mysql install syntax, etc.

SQL Server触发器创建、删除、修改、查看示例教程 触发器是一种特殊的存储过程﹐它不能被显式地调用﹐而是在往表中插入记录﹑更新记录或者删除记录时被自动地激活。所以触发器可以用来实现对表实施复杂的完整性约束。-Create, delete, modify the SQL_Server trigger, see the tutorial example Trigger is a special procedure, it can not be called explicitly,