openGauss每日一练第5天 | 创建用户、修改用户属性、更改用户权限和删除用户

1.创建用户user1、user2和user3，user1具有CREATEROLE权限，user2具有CREATEDB权限，要求使用两种不同的方法设置密码

  create user user1 createrole password 'test_123';

  create user user2 createdb password 'test_456';

  create user user3 password 'test_789';

2.修改用户user1的密码

alter user user1 identified by 'pass_123456';

3.重命名用户user2

 alter user user2 rename to user222;

4.将用户user1的权限授权给用户user3，再回收用户user3的权限

grant user1 to user3;

revoke all privilege from user1;

5.删除所有创建用户

drop user user1;

drop user user2;

drop user user3;

drop user user222;

6. 过程中使用\du或\du+查看用户信息

\du+

List of roles
Role name | Attributes
| Member of | Description
-----------+-------------------------------------------------------------------------------------
-----------------------------+-----------+-------------
omm=# gaussdb | Sysadmin
| {} |
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Opera
toradmin, Policyadmin, UseFT | {} |
user222 | Create DB
| {} |