SQL可以对视图进行加密.也就是,可永久隐藏视图定义的文本. 注意 此操作不可逆.加密视图后,无法再修改它,因为无法再看到视图定义.如果需要修改加密视图,则必须删除它并重新创建另一个视图. 示例代码: create view userFt as select users.userID,users.userName,users.ftNum,ft.Subject,ft.Content from users inner join ft on users.userID=ft.userID go al…
Sql Server 基础知识: http://blog.csdn.net/t6786780/article/details/4525652 Sql Server 语句大全: http://www.cnblogs.com/yubinfeng/archive/2010/11/02/1867386.html…
SQL语法基础之DROP语句 作者:尹正杰 版权声明:原创作品,谢绝转载!否则将追究法律责任. 一.查看DROP帮助信息 mysql> ? DROP Many help items for your request exist. To make a more specific request, please type 'help <item>', where <item> is one of the following topics: ALTER TABLE DEALLOCA…
SQL语法基础之ALTER语句 作者:尹正杰 版权声明:原创作品,谢绝转载!否则将追究法律责任. 一.查看ALTER的帮助信息 mysql> ? ALTER Many help items for your request exist. To make a more specific request, please type 'help <item>', where <item> is one of the following topics: ALTER DATABASE A…