oracle將一個用戶的權限賦予給另外一個用戶

查詢用戶擁有的對象操作權限

select * from dba_tab_privs where grantee='USERA';

給USERB授權USERA用戶下所有表的權限腳本生成語句

select 'grant select,insert,update,delete on '||owner||'.'||object_name|| ' to USERB;' 
from dba_objects 
 where object_type='TABLE'  and owner='USERA';