Need help in some what complex transpose of data...

Question

Dear Team,
I need a small help, to transpose the data...
The Input data is shown below...
Product
Level
Position
Route
1st_Prod_id
Request_Flag
Qty
99904228
LEVEL_1
1
1
828452
Y
0
96500436
LEVEL_2
2
1
828452
N
1
96500437
LEVEL_2
3
1
828452
N
1
96500437
LEVEL_3
4
1
828452
N
2
66500084
LEVEL_3
5
1
828452
Y
0
67653972
LEVEL_3
6
1
828452
N
2
47418545
LEVEL_4
7
1
828452
Y
0
47418545
LEVEL_5
8
1
828452
N
0
35264043
LEVEL_5
9
1
828452
N
2
37411616
LEVEL_5
10
1
828452
N
0
35264044
LEVEL_6
11
1
828452
Y
2
The output format is shown below along with transpose logic...
Dmd_Product
From_Prod
From_Level
To_Prod
To_Level
Total_QtY
99904228
99904228
LEVEL_1
66500084
LEVEL_3
4
99904228
66500084
LEVEL_3
47418545
LEVEL_4
2
99904228
47418545
LEVEL_4
35264044
LEVEL_6
4
1. Depending upon the Req_Flag = 'Y', we have to identify our from_product - to_product, & from_level - to_level...
2. Between from_product - to_product we have to sum up the quantity (QTY)
3. The position 1 product should remain as it throught out the transformation and shown under new column Dmd_Prod
4. Between Position 1 and Position 5 we have 2 Req_Flag --> One req_flag = 'Y' at pos = 1 and another req_flag = 'Y' at pos = 5
   So my From_Product will be product as pos = 1 and to_product will be product at pos = 5...
5. The same iteration goes on and my product at pos = 5 becomes my from_product and another item at pos = 7 becomes to_product... and so on...
I hope i am clear in my explanation...
please give me some hints or tips how to solve it...
Attached is the create table statement for sample data...
Create Table test As
(Select 99904228 prod, 'LEVEL_1' l_level, 828452 first_prod_id,  1 position,  1 route, 'Y' req_flag, 0 qty From dual Union All 
Select 96500436 prod, 'LEVEL_2' l_level, 828452 first_prod_id,  2 position,  1 route, 'N' req_flag, 1 qty From dual Union All
Select 96500437 prod, 'LEVEL_2' l_level, 828452 first_prod_id,  3 position,  1 route, 'N' req_flag, 1 qty From dual Union All
Select 96500437 prod, 'LEVEL_3' l_level, 828452 first_prod_id,  4 position,  1 route, 'N' req_flag, 2 qty From dual Union All
Select 66500084 prod, 'LEVEL_3' l_level, 828452 first_prod_id,  5 position,  1 route, 'Y' req_flag, 0 qty From dual Union All
Select 67653972 prod, 'LEVEL_3' l_level, 828452 first_prod_id,  6 position,  1 route, 'N' req_flag, 2 qty From dual Union All
Select 47418545 prod, 'LEVEL_4' l_level, 828452 first_prod_id,  7 position,  1 route, 'Y' req_flag, 0 qty From dual Union All
Select 47418545 prod, 'LEVEL_5' l_level, 828452 first_prod_id,  8 position,  1 route, 'N' req_flag, 0 qty From dual Union All
Select 35264043 prod, 'LEVEL_5' l_level, 828452 first_prod_id,  9 position,  1 route, 'N' req_flag, 2 qty From dual Union All
Select 37411616 prod, 'LEVEL_5' l_level, 828452 first_prod_id,  10 position, 1 route, 'N' req_flag, 0 qty From dual Union All
Select 35264044 prod, 'LEVEL_6' l_level, 828452 first_prod_id,  11 position, 1 route, 'Y' req_flag, 2 qty From dual
Regards
nic..

Answer 1

Maybe
select dmd_product,
       from_product,
       from_level,
       to_product,
       to_level,
       total_qty,
       agg_yield
  from (select position,
               dmd_product,
               case when to_flag = 'Y' and lag(from_flag,1) over (order by position) = 'Y'
                    then lag(from_product,1) over (order by position)
               end from_product,
               case when to_flag = 'Y' and lag(from_flag,1) over (order by position) = 'Y'
                    then lag(from_level,1) over (order by position)
               end from_level,
               to_product,
               to_level,
               total_qty,
               case when total_qty is not null
                    then yield
               end agg_yield
          from (select position,
                      first_value(dmd_product ignore nulls) over (order by position) dmd_product,
                      from_product,
                      from_level,
                      to_product,
                      to_level,
                      case to_flag when 'Y'
                                   then total_qty -
                                        lag(total_qty,1) over (order by position) +
                                        lead(qty,1) over (order by position)
                      end total_qty,
                      case when to_flag = 'Y'
                            and lead(to_flag,1) over (order by position) = 'N'
                           then yield
                           else yield * lead(yield,1) over (order by position) / 100
                      end yield,
                      from_flag,
                      to_flag
                 from (select position,
                              case when req_flag = 'Y'
                                    and position = (select min(position)
                                                      from test
                                                     where req_flag = 'Y'
                                   then prod
                              end dmd_product,
                              prod from_product,
                              l_level from_level,
                              req_flag from_flag,
                              lead(prod,1) over (order by position) to_product,
                              lead(l_level,1) over (order by position) to_level,
                              lead(req_flag,1) over (order by position) to_flag,
                              qty,
                              sum(qty) over (order by position) total_qty,
                              last_value(nullif(yield,100) ignore nulls) over (order by position) yield
                         from test
                where from_flag != 'N'
                   or to_flag != 'N'
         where dmd_product is not null
where from_product is not null
order by position
DMD_PRODUCT
FROM_PRODUCT
FROM_LEVEL
TO_PRODUCT
TO_LEVEL
TOTAL_QTY
AGG_YIELD
99904228
99904228
LEVEL_1
66500084
LEVEL_3
4
92
99904228
66500084
LEVEL_3
47418545
LEVEL_4
2
90
99904228
47418545
LEVEL_4
35264044
LEVEL_6
4
97.02
Regards
Etbin