Can anybody help me to buil this query

Question

Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE     10.2.0.1.0     Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
============================
table1
======
lvl1 lvl2 lvl3 lvl4 value
============================
a b c c1 100
a b c c2 200
a e d 30
table2
=========
lvl parenttochild
==================
a 1
b 2
e 2
c 3
d 3
c1 4
c2 4
can i make it from the above table
lvl parenttochild value
=========================
a 1 330
b 2 300
e 2 30
c 3 300
d 3 30
c1 4 100
c2 4 200

Answer 1

user5813325 wrote:
1st two column coming from table 2 and next column-sum of all(a) 330,sum(b)-300 like that way...Not clear with this explanation.
But still,
--Sample table
with table1
as
select 'a' lvl1, 'b' lvl2, 'c' lvl3, 'c1' lvl4, 100 value from dual
union all
select 'a', 'b', 'c', 'c2', 200 from dual
union all
select 'a', 'e', 'd', '', 30 from dual
), table2
as
select 'a' lvl, 1 parenttochild from dual
union all
select 'b', 2 from dual
union all
select 'e', 2 from dual
union all
select 'c', 3 from dual
union all
select 'd', 3 from dual
union all
select 'c1', 4 from dual
union all
select 'c2', 4 from dual
-- End of sample table
-- Main Select
select t2.lvl, t1.value
  from (
          select decode(no, 1, lvl1, 2, lvl2, 3, lvl3, 4, lvl4) lvl, sum(value) value
            from table1,
                 (select level no from dual connect by level <= 4) -- Number of columns 4
           where decode(no, 1, lvl1, 2, lvl2, 3, lvl3, 4, lvl4) is not null
           group
              by decode(no, 1, lvl1, 2, lvl2, 3, lvl3, 4, lvl4)
       ) t1
  left
  join table2 t2     
    on t1.lvl = t2.lvl
--End of main select
LVL VALUE                 
a   330                   
b   300                   
e   30                    
c   300                   
d   30                    
c1  100                   
c2  200