待续...
select * from user_tables  -- select current user's owned tables
 select * from all_tables  -- -- select current user's can be visited tables
 select * from v$version; -- select current version
 select * from PRODUCT_COMPONENT_VERSION; -- select current version
select user from dual; -- 查看当前登陆的用户名:
select * from user_users; -- 查看当前登陆的用户名:
select * from user_role_privs; -- 查看当前用户拥有的角色和权限:
 select * from session_privs; -- 查看当前用户拥有的角色和权限:










