openGauss每日一练第5天

1.创建用户
–以下两种设置密码方法等效

CREATE USER jim PASSWORD 'abcd@123';
CREATE USER kim IDENTIFIED BY 'abcd@456';
–用户dim具有创建数据库权限

CREATE USER dim CREATEDB PASSWORD 'abcd@789';
–查看用户

\du
2.修改用户属性
–修改密码

ALTER USER jim IDENTIFIED BY 'Abcd@123' REPLACE 'abcd@123';
–为用户jim增加CREATEROLE权限

ALTER USER jim CREATEROLE;
–查看用户

\du
3.授权
–将用户jim的权限授权给用户kim

GRANT jim to kim;
–将sysadmin权限授权给用户dim

GRANT ALL PRIVILEGES TO dim;
–重命名用户dim

alter user dim rename to tim;
–查看用户

\du
4.回收权限
–撤消kim的权限

REVOKE jim FROM kim;
–撤消用户dim的sysadmin权限

revoke all privilege from tim;
–查看用户

\du
5.删除用户

drop user tim;
drop user jim;
drop user kim;
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 createrole password 'user_123';
create user user2 createdb identified by 'user_123';
create user user3 password 'user_123';

2.修改用户user1的密码

alter user user1 identified by 'user_456' replace 'user_123';
3.重命名用户user2
alter user user2 rename to user20;

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 user1 from user3;
revoke all privilege from user3;

5.删除所有创建用户
过程中使用\du或\du+查看用户信息
\du
drop user user1
\du
drop user user20
\du
drop user user3
\du