将两个表结果分组，没有重复的结果

Question

我正在尝试从两个不同的表中为特定用户获取角色和权限。我的查询是这样的：

Select r.grantee, r.granted_role , s.privilege 
From dba_role_privs r, dba_sys_privs s 
Where r.grantee=s.grantee and r.grantee=(select username from dba_users where username='HR'); 

我的结局是这样的：

GRANTEE    GRANTED_ROLE         PRIVILEGE
---------- -------------------- --------------------
HR         DBA                  CREATE VIEW
HR         RESOURCE             CREATE VIEW
HR         DBA                  UNLIMITED TABLESPACE
HR         RESOURCE             UNLIMITED TABLESPACE
HR         DBA                  CREATE DATABASE LINK
HR         RESOURCE             CREATE DATABASE LINK
HR         DBA                  CREATE SEQUENCE
HR         RESOURCE             CREATE SEQUENCE
HR         DBA                  CREATE SESSION
HR         RESOURCE             CREATE SESSION
HR         DBA                  ALTER SESSION

GRANTEE    GRANTED_ROLE         PRIVILEGE
---------- -------------------- --------------------
HR         RESOURCE             ALTER SESSION
HR         DBA                  CREATE SYNONYM
HR         RESOURCE             CREATE SYNONYM

14 rows selected.

当用户没有很多角色/权限时这很好，但是对于像 SYS 这样的用户，例如，我最终会得到10600 rows selected.

有没有办法让查询结果更好？我错过了加入吗？

PS：我正在开发 oracle 11g。

如果您可以帮助改进它，请这样做

提前致谢！

Answer 1

也许您想要union all 而不是加入：

Select r.grantee, r.granted_role as role_or_privilege
From dba_role_privs r, 
Where r.grantee = (select username from dba_users where username = 'HR'); 
union all
select s.grantee, s.privilege 
from dba_sys_privs s 
Where s.grantee = (select username from dba_users where username = 'HR'); 

我将where 中的逻辑与您的查询中的逻辑相同。但是，这对我来说更有意义：

Select r.grantee, r.granted_role as role_or_privilege
From dba_role_privs r, 
Where r.grantee = 'HR'; 
union all
select s.grantee, s.privilege 
from dba_sys_privs s 
Where s.grantee = 'HR';