Stuck with - Update- help needed

Question

Hello all and thank you for reading!
I have the following problem with update statment. Tables and data in them are as follows:
Table 1: XML_TRANSFER
create table XML_TRANSFER as
select 111111 TAX_NR, 1 TYPE, 3000 PRIJ, 3000 POBOT from dual union all
select 222222 TAX_NR, 1 TYPE, 720.7 PRIJ, 350.70 POBOT from dual union all
select 333333 TAX_NR, 1 TYPE, 2600 PRIJ, 2100 POBOT from dual;Table 2: FIR_SET
create table FIR_SET as
select 2011 LET, 7 KROG, 111111 TAX_NR, 10 STEV_FAK, 2000 VALUE_ODPR, 0 VALUE_POBOT from dual union all
select 2011 LET, 7 KROG, 111111 TAX_NR, 11 STEV_FAK, 400 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 111111 TAX_NR, 12 STEV_FAK, 400 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 111111 TAX_NR, 13 STEV_FAK, 200 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 222222 TAX_NR, 1 STEV_FAK, 200 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 222222 TAX_NR, 2 STEV_FAK, 20.7 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 222222 TAX_NR, 3 STEV_FAK, 100 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 222222 TAX_NR, 4 STEV_FAK, 400 VALUE_ODPR, 0 VALUE_POBOT  from dual union all
select 2011 LET, 7 KROG, 333333 TAX_NR, 81 STEV_FAK, 2600 VALUE_ODPR, 0 VALUE_POBOT  from dual;Ok, tables and data are set now for the "update" logic.
Lets look at the data in table XML_TRANSFER.
First row (with TAX_NR = 111111):
UPDATE statment in this case should work like: the VALUE_ODPR should be same as VALUE_POBOT in table FIR_SET.
This part i managed to do with this SQL:
PROCEDURE     xml_update is
BEGIN
update fir_set an
set an.value_pobot = an.value_odpr
where let = (select distinct max(let) from fir_set)
and krog = (select max(krog) from fir_set)
and
  (select sum(a.VALUE_ODPR)-b.POBOT
  from fir_SET a, xml_transfer b
  WHERE a.tax_nr = b.tax_nr
  and an.tax_nr = a.tax_nr
  group by a.tax_nr,b.POBOT) = 0;
  commit;
  end;Resoult is as:
LET                     KROG                  TAX_NR                 STEV_FAK                VALUE_ODPR            VALUE_POBOT                 
2011                    7                      111111                 10                     2000                   2000 
2011                    7                      111111                 11                     400                    400
2011                    7                      111111                 12                     100                    100 
2011                    7                      111111                 13                     200                    200                Ok the next example is a bit more tricky and i cant figure it out. I dont know how to explain it properly ... i will
just post the resoult and try to explain it:
LET                     KROG                  TAX_NR                 STEV_FAK                VALUE_ODPR            VALUE_POBOT                 
2011                    7                      222222                 1                      200                    200 
2011                    7                      222222                 2                      20.7                   20.7
2011                    7                      222222                 3                      100                    100 
2011                    7                      222222                 4                      400                    30   So what we need to do is we check is XML_TRANSFER.POBOT - VALUE_ODPR > 0, IF this is it then we update VALUE_POBOT with VALUE_ODPR.
In next row we check again if above statment is correct and if it is we do the same. The process will continue as long as statment
will be correct.
If statment is no longer correct we have to do this operation: XML_TRANSFER.POBOT - SUM(VALUE_ODPR) (INSIDE SAME TAX_NR!!! So group by tax_nr!!)
and update last row with given resoult. By no means we can get negative numbers.
I really do help i explained my problem so that you will understand what i want to achive. If you have any questions please feel free to ask.
Thank you for your help!
Best regards, Cain!

Answer 1

Hello and thank you again for taking your time!
SQL you posted is still not quite right but we are almost there ... let me show you how it should look like (i have add a little more data into tables):
Table XML_TRANSFER:
    TAX_NR       TYPE       PRIJ      POBOT
    111111          1       3000       3000
    222222          1      720,7        200
    333333          1       2600       2100
    444444          1       1000       1000
    555555          1       5000       3000Those are resoults i get running your SQL .....
       LET       KROG     TAX_NR   STEV_FAK VALUE_ODPR VALUE_POBOT
      2011          7     111111         10       2000        2000
      2011          7     111111         11        400         400
      2011          7     111111         12        400         400
      2011          7     111111         13        200         200
      2011          7     222222          1        200         200
      2011          7     222222          2       20,7           0
      2011          7     222222          3        100           0
      2011          7     222222          4        400           0
      2011          7     333333         81       2600           0
      2011          7     444444         55       1000        1000
      2011          7     555555        111       2000           0
      2011          7     555555         82       1000        1000
      2011          7     555555         83       1500        1500the correct resoults should be:
       LET       KROG     TAX_NR   STEV_FAK VALUE_ODPR VALUE_POBOT
      2011          7     111111         10       2000        2000
      2011          7     111111         11        400         400
      2011          7     111111         12        400         400
      2011          7     111111         13        200         200
      2011          7     222222          1        200         200
      2011          7     222222          2       20,7           0
      2011          7     222222          3        100           0
      2011          7     222222          4        400           0
      2011          7     333333         81       2600         2100
      2011          7     444444         55       1000        1000
      2011          7     555555        111       2000       500  
      2011          7     555555         82       1000        1000
      2011          7     555555         83       1500        1500Note at line 2011          7     333333         81       2600         2100 and at line 2011          7     555555        111       2000       500    I hope its more clear now.
PS at 2600 the correct resoult is 2100 and not 0.
Thank you
best regards!
Edited by: Cain_oracle on 24.8.2011 1:08