查询所有用户
select * from mysql.user;

增加用户
insert into mysql.user(Host,User,Password) values("%","admin",password("SP@temobi"));
flush privileges;? 这一步骤很重要，要不然会报错！所以必须执行！


新建数据库授权给admin用户
create database sqview;
grant all privileges on sqview.* to admin;
flush privileges;


删除用户
DELETE FROM mysql.user WHERE User="admin" and Host="%";