断言 assertion 设置每一门课程最多有60人选修 create assertion a check (60 > all ( select count(*) from sc group by cno) );
drop assertion a;
触发器 trigger 删除触发器 drop tigger a on student
存储过程
定义一个没有返回值的存储过程 create procedure my…
用户管理
查询用户 use mysql select * from user use mydb select * from mysql.user
– 创建用户 create user ‘zhangsan’ identified by ‘zhangsan’ – create user ‘用户名’‘主机名’ identified by ‘密码’ create user ‘lisi’‘localhost’ identified by ‘…