openGauss每日一练 | 5.1 学习openGauss创建用户、修改用户属性、更改用户权限和删除用户

课程作业

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 password 'user1_123';
alter user user1 createrole;

create user user2 identified by 'user2_456';
alter user user2 createdb;

create user user3 identified by 'user3_789';

2.修改用户user1的密码

alter user user1 identified by 'user10_123';

3.重命名用户user2

alter user user2 rename to user20;

omm=# \du 
                                                              List of roles
 Role name |                                                    Attributes                                                    | Member of 
-----------+------------------------------------------------------------------------------------------------------------------+-----------
 gaussdb   | Sysadmin                                                                                                         | {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
 user1     | Create role                                                                                                      | {}
 user20    | Create DB                                                                                                        | {}
 user3     |                                                                                                                  | {}

4.将用户user1的权限授权给用户user3，再回收用户user3的权限

omm=# grant user1 to user3;
GRANT ROLE
omm=# 
omm=# \du+
                                                                     List of roles
 Role name |                                                    Attributes                                                    | Member of | Description 
-----------+------------------------------------------------------------------------------------------------------------------+-----------+-------------
 gaussdb   | Sysadmin                                                                                                         | {}        | 
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}        | 
 user1     | Create role                                                                                                      | {}        | 
 user20    | Create DB                                                                                                        | {}        | 
 user3     |                                                                                                                  | {user1}   | 
 
 omm=# revoke user1 from user3;
REVOKE ROLE
omm=# \du+
                                                                     List of roles
 Role name |                                                    Attributes                                                    | Member of | Description 
-----------+------------------------------------------------------------------------------------------------------------------+-----------+-------------
 gaussdb   | Sysadmin                                                                                                         | {}        | 
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}        | 
 user1     | Create role                                                                                                      | {}        | 
 user20    | Create DB                                                                                                        | {}        | 
 user3     |                                                                                                                  | {}        | 

5.删除所有创建用户

drop user user1;
drop user user20;
drop user user3;

openGauss SQL学习参考资料