1、创建两个新用户U_student1和U_student2,密码分别为1234和5678

create user U_student1@localhost identified by '1234',
U_student2@localhost identified by '5678';

2、创建两个新用户的详细信息保存在MySQL数据库的user表中

use mysql;
select user, host, authentication_string from user;

3、修改用户名

rename user U_student1@localhost to U_stu1;

4、修改用户密码

alter user U_student2@localhost identified by 'abc123';

5、删除用户

drop user U_stu1, U_student2@localhost;

6、授予权限

使用grant语句，对用户U_student 所有的数据有查询和插入的权限，并授予grant权限

创建用户U_student

create user U_student@localhost identified by '123';

grant select, insert on *.*
to U_student@localhost
with grant option;

使用grant 语句将d_eams数据库中的student 表中的student delete 权限授予用户U_student

grant delete on d_eams.student
to U_student@localhost;

使用grant语句将d_eams数据库中的sc表中成绩列的update权限授予用户U_student

grant update(成