Want to select query based on sample data.

Question

My Oracle Version
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
I am creating inventory valuation report using FIFO method . here sample data .
create table tranx(
TRXTYPE     varchar2(10) ,ITEM_CODE varchar2(10),     RATE number,qty number
insert into tranx values('IN'     ,'14042014',     457.2     ,10);
insert into tranx values('OUT','14042014',     0,          10);
insert into tranx  values('IN','14042014',     458.1,     35);
insert into  tranx values('OUT','14042014',     0,          11);
insert into  tranx values('OUT','14042014',     0,          6);
insert into  tranx values('IN','     14042014',     457.2     ,10);
insert into tranx  values('OUT','     14042014',     0,          3);
insert into tranx  values('OUT','     14042014',     0,          4);
insert into tranx  values('IN','     14042014',     457.2,     20);
insert into tranx  values('OUT','     14042014',     0,          5);
insert into tranx  values('OUT','     14042014',     0,          9);
insert into tranx  values('OUT','     14042014',     0,          8);
current output
TRXTYPE     ITEM_CODE     RATE      QTY
IN     14042014     457.2     10
OUT     14042014     0          10
IN     14042014     458.1     35
OUT     14042014     0          11
OUT     14042014     0          6
IN     14042014     457.2     10
OUT     14042014     0          3
OUT     14042014     0          4
IN     14042014     457.2     20
OUT     14042014     0          5
OUT     14042014     0          9
OUT     14042014     0          8above data populate based on first in first out . but out rate is not comes from that query. suppose fist 10 qty are OUT its rate same as IN. but when qty start out from 35 rate will be 458.1 till all 35 qty will not out. like out qty 11,6,3,4,5,9 now total are 38 .
when qty 9 will out the rate are 6 qty rate 458.1 and other 3 out rate of 457.2 means total value of 9 out qty value is 4120.20 .
Now 35 qty is completed and after that rate will continue with 457.2 till 10 qty not completed.
I think you understand my detail if not please tell me .
thanks
i am waiting your reply.

Answer 1

As SomeoneElse mentioned, there is no row order in relational tables, so you can't tell which row is first and which is next unless ORDER BY is used. So I added column SEQ to your table:
SQL> select  *
  2    from  tranx
  3  /
TRXTYPE    ITEM_CODE        RATE        QTY        SEQ
IN         14042014        457.2         10          1
OUT        14042014            0         10          2
IN         14042014        458.1         35          3
OUT        14042014            0         11          4
OUT        14042014            0          6          5
IN         14042014        457.2         10          6
OUT        14042014            0          3          7
OUT        14042014            0          4          8
IN         14042014        457.2         20          9
OUT        14042014            0          5         10
OUT        14042014            0          9         11
TRXTYPE    ITEM_CODE        RATE        QTY        SEQ
OUT        14042014            0          8         12
12 rows selected.
SQL> Now it can be solved. Your task requires either hierarchical or recursive solution. Below is recursive solution using MODEL:
with t as (
           select  tranx.*,
                   case trxtype
                     when 'IN' then row_number() over(partition by item_code,trxtype order by seq)
                     else 0
                   end rn_in,
                   case trxtype
                     when 'OUT' then row_number() over(partition by item_code,trxtype order by seq)
                     else 0
                   end rn_out,
                   count(case trxtype when 'OUT' then 1 end) over(partition by item_code) cnt_out
             from  tranx
select  trxtype,
        item_code,
        rate,
        qty
  from  t
  model
    partition by(item_code)
    dimension by(rn_in,rn_out)
    measures(trxtype,rate,qty,qty qty_remainder,cnt_out,1 current_in,seq)
    rules iterate(10) until(iteration_number + 1 = cnt_out[0,1])
     rate[0,iteration_number + 1]          = rate[current_in[1,0],0],
     qty_remainder[0,iteration_number + 1] = case sign(qty_remainder[0,cv() - 1])
                                               when 1 then qty_remainder[0,cv() - 1] - qty[0,cv()]
                                               else qty[current_in[1,0],0] - qty[0,cv()] + nvl(qty_remainder[0,cv() - 1],0)
                                             end,
     current_in[1,0]                       = case sign(qty_remainder[0,iteration_number + 1])
                                               when 1 then current_in[1,0]
                                               else current_in[1,0] + 1
                                             end
  order by seq
TRXTYPE    ITEM_CODE        RATE        QTY
IN         14042014        457.2         10
OUT        14042014        457.2         10
IN         14042014        458.1         35
OUT        14042014        458.1         11
OUT        14042014        458.1          6
IN         14042014        457.2         10
OUT        14042014        458.1          3
OUT        14042014        458.1          4
IN         14042014        457.2         20
OUT        14042014        458.1          5
OUT        14042014        458.1          9
TRXTYPE    ITEM_CODE        RATE        QTY
OUT        14042014        457.2          8
12 rows selected.
SQL> SY.