如下：

SQL> with t as

2  ( select 100 userid, 0 parentid, 90 amount from dual

3    union all

4    select 110, 100, 80 from dual

5    union all

6    select 120, 110, 70 from dual

7    union all

8    select 130, 120, 60 from dual

9    union all

10    select 200, 0, 50 from dual

11    union all

12    select 210, 200, 40 from dual

13    union all

14    select 220, 210, 30 from dual

15  )

16  select  userid,

17          sum(amount) amount

18  from

19  (select CONNECT_BY_ROOT(userid) userid,

20          amount

21    from t

22  where level <> 1

23    connect by prior userid = parentid)

24  group by userid

25  order by 1;

USERID     AMOUNT

---------- ----------

100        210

110        130

120         60

200         70

210         30

SQL>