/
Create user selectuser Identified By xd123456; //创建用户
grant create session to selectuser;
GRANT SELECT ANY DICTIONARY TO selectuser; //授予所有字典的查询权限
GRANT SELECT ANY SEQUENCE TO selectuser; //授予所有序列的查询权限
GRANT SELECT ANY TABLE TO selectuser; //授予所有表的查询权限
GRANT SELECT ANY VIEW TO selectuser; //授予所有视图的查询权限
----但是VIEW命令好像没有此命令（待定） ORA-00990: 权限缺失或无效 /
select
reader
