HELP : Summing amounts along a Hierarchy.

Question

Hi All,
I need a query to help me with summing-up amounts along a hierarchy.
Data is only at the lowest level and needs to be summed up along the
hierarchy accordingly. Each level above the lowest level needs to
have an amount that is the sum of amounts in the levels below.
Sample Data:
Id Parent_id Level amount
1 1 0
2 1 2 0
3 1 2 0
4 1 2 0
5 2 3 0
6 2 3 0
7 3 3 0
8 4 3 0
9 5 4 10
10 5 4 10
11 6 4 10
12 8 4 10
13 8 4 10
Desired Output:
Id Amount
1 50
2 30
5 20
9 10
10 10
6 10
11 10
3 0
7 0
4 20
8 20
12 10
13 10
I have tried using the following select but the results
select tn.parent_id,
sum (tn.amount)
from table_name tn
group by tn.parent_id
connect by prior tn.id = tn.parent_id
start with tn.task_id = 1
and the results I get are:
Id Amount
1 0
2 0
5 20
9 10
10 10
6 10
11 10
3 0
7 0
4 0
8 20
12 10
13 10
Am I on the right track and what do I need to modify if so.
Otherwise, will you please suggest a new way to do this ?
Thanks in advance,

Answer 1

Like this one ?
SQL> with tbl as
  2  (select 1  c1, null c2, 0 c3, null c4 from dual union all
  3   select 2  c1, 1 c2, 2 c3, 0  c4 from dual union all
  4   select 3  c1, 1 c2, 2 c3, 0  c4 from dual union all
  5   select 4  c1, 1 c2, 2 c3, 0  c4 from dual union all
  6   select 5  c1, 2 c2, 3 c3, 0  c4 from dual union all
  7   select 6  c1, 2 c2, 3 c3, 0  c4 from dual union all
  8   select 7  c1, 3 c2, 3 c3, 0  c4 from dual union all
  9   select 8  c1, 4 c2, 3 c3, 0  c4 from dual union all
10   select 9  c1, 5 c2, 4 c3, 10 c4 from dual union all
11   select 10 c1, 5 c2, 4 c3, 10 c4 from dual union all
12   select 11 c1, 6 c2, 4 c3, 10 c4 from dual union all
13   select 12 c1, 8 c2, 4 c3, 10 c4 from dual union all
14   select 13 c1, 8 c2, 4 c3, 10 c4 from dual )
15  select c1, c2, c3, c4
16  from   (select c1, c2, c3, sum(c4) over (partition by connect_by_root c1) as c4, level lv
17          from   tbl
18          connect by prior c1 = c2)
19  where lv = 1;
             C1              C2              C3              C4
              1                               0              50
              2               1               2              30
              3               1               2               0
              4               1               2              20
              5               2               3              20
              6               2               3              10
              7               3               3               0
              8               4               3              20
              9               5               4              10
             10               5               4              10
             11               6               4              10
             12               8               4              10
             13               8               4              10
13 rows selected.
Elapsed: 00:00:00.03Nicolas.