How to make a summary on one level of the query

Question

Hi
I have the following table relationship
Father -< Child -< GrandChild
Every table has numeric values that I would like to summarize but I have only one query:
select ...
from Father, Child, GrandChild
where Father.id = Child.parentId(+) and
Child.id = GrandChild.parentId(+)
In this query I would like to summarize values from Child and GrandChild. But if I summarize Child values they will be repeated depending on the number of GrandChild he has. So is there a way to do a "SUM" that will only summarize the values in Child without values repeating? SUM DISTINCT will not work because I can have values in two Childs that are equal.
Regards,
Néstor Boscán

Answer 1

Hi,
You should give sample data and expected result. Without that I can only guess what you want.
My guess is this:
with father as
select 1 f_id, 'f1' f_name from dual union all
select 2 f_id, 'f2' f_name from dual union all
select 3 f_id, 'f3' f_name from dual union all
select 4 f_id, 'f4' f_name from dual
,child as
select 11 c_id, 'c11' c_name, 1 parentid from dual union all
select 12 c_id, 'c12' c_name, 1 parentid from dual union all
select 13 c_id, 'c13' c_name, 2 parentid from dual union all
select 14 c_id, 'c14' c_name, 3 parentid from dual union all
select 15 c_id, 'c15' c_name, 4 parentid from dual union all
select 16 c_id, 'c16' c_name, 4 parentid from dual
,GrandChild as
select 101 gc_id, 'gc101' gc_name, 11 parentid ,1 age from dual union all
select 102 gc_id, 'gc102' gc_name, 11 parentid ,2 age from dual union all
select 103 gc_id, 'gc103' gc_name, 12 parentid ,4 age from dual union all
select 104 gc_id, 'gc104' gc_name, 12 parentid ,8 age from dual union all
select 105 gc_id, 'gc105' gc_name, 11 parentid ,16 age from dual union all
select 106 gc_id, 'gc106' gc_name, 14 parentid ,32 age from dual union all
select 107 gc_id, 'gc107' gc_name, 13 parentid ,64 age from dual
SELECT
     f_name
     ,case grouping_id(f_name, c_name) when 0 then c_name else 'All Childeren' end c_name
     ,case grouping_id(f_name, c_name, gc_name)  when 0 then gc_name else 'All grand Children' end gc_name
     ,sum(age)
FROM
     Father
, Child
, GrandChild
WHERE
     Father.f_id    = Child.parentId(+)
     AND Child.c_id = GrandChild.parentId(+)
group by
grouping sets
          (f_name, c_name, gc_name)
          ,(f_name, c_name)
          ,(f_name)
F_NAME C_NAME        GC_NAME            SUM(AGE)
f1     c11           gc101                     1
f1     c11           gc102                     2
f1     c11           gc105                    16
f1     c11           All grand Children       19
f1     c12           gc103                     4
f1     c12           gc104                     8
f1     c12           All grand Children       12
f1     All Childeren All grand Children       31
f2     c13           gc107                    64
f2     c13           All grand Children       64
f2     All Childeren All grand Children       64
f3     c14           gc106                    32
f3     c14           All grand Children       32
f3     All Childeren All grand Children       32
f4     c15                                      
f4     c15           All grand Children         
f4     c16                                      
f4     c16           All grand Children         
f4     All Childeren All grand Children         
19 rows selected Regards,
Peter