mysql查看用户列表，查看用户授权，创建用户授权，删除用户

查看用户列表
select from host,user,password from mysql.user;

查看授权
show grants for root@localhost;

建用户授权
grant all privileges on . to root@localhost identified by '123456';

删除用户
delete from mysql.user user='root'
delete from mysql.user where user='root' and ip='localhost';