Compare column data of two rows

Question

Hi there,
I a have a table
COMP_ID      PROD      COLOR       COMPAREFLAG  ORDER_NUMBER
1           sun      red            -                          2
2              sun      blue          Y                         2
3           horse      black         -                          1
4              horse   white            Y                         1
5           chair      black          -                         3
6          chair    black          Y                         3I would like to compare for example the columns PROD and COLOR of two rows with ORDER_NUMBER = 2
The row with COMP_ID = 1 is the first entry and with COMP_ID = 2 the second one therefore the COMPAREFLAG is set to 'Y'.
If the entries are diffrent both rows should be return to output.
I would like to compare also the rows with COMP_ID 5 and 6. In this case nothing should be return to output.
I don't know how to manage this. Can anyone please help me?
Thanks,
ben
Message was edited by:
ben512

Answer 1

I hope that I well understand.
Do you want to get rows only if PROD/COLOR of one row is different of the PROD/COLOR from other row (with the same order_number) ?
What you can try :
SQL> with tbl as
  2  (select 1 comp_id, 'sun'   prod, 'red'   color, null compareflag, 2 order_number from dual union all
  3   select 2 comp_id, 'sun'   prod, 'blue'  color, 'Y'  compareflag, 2 order_number from dual union all
  4   select 3 comp_id, 'horse' prod, 'black' color, null compareflag, 1 order_number from dual union all
  5   select 4 comp_id, 'horse' prod, 'white' color, 'Y'  compareflag, 1 order_number from dual union all
  6   select 5 comp_id, 'chair' prod, 'black' color, null compareflag, 3 order_number from dual union all
  7   select 6 comp_id, 'chair' prod, 'black' color, 'Y'  compareflag, 3 order_number from dual )
  8  select comp_id, prod, color, compareflag, order_number
  9  from  (select comp_id,
10                prod,
11                decode(first_value(prod) over (partition by order_number order by comp_id range between unbounded preceding and unbounded following),
12                       last_value(prod) over (partition by order_number order by comp_id  range between unbounded preceding and unbounded following),null,prod) prod_d,
13                color,
14                decode(first_value(color) over (partition by order_number order by comp_id range between unbounded preceding and unbounded following),
15                       last_value(color) over (partition by order_number order by comp_id  range between unbounded preceding and unbounded following),null,color) color_d,
16                 compareflag,
17                 order_number
18         from   tbl
19         where  order_number=&order_number)
20  where  (prod_d is not null or color_d is not null)
21  order by 1;
Enter value for order_number: 1
old  19:        where  order_number=&order_number)
new  19:        where  order_number=1)
   COMP_ID PROD  COLOR C ORDER_NUMBER
         3 horse black              1
         4 horse white Y            1
SQL> /
Enter value for order_number: 2
old  19:        where  order_number=&order_number)
new  19:        where  order_number=2)
   COMP_ID PROD  COLOR C ORDER_NUMBER
         1 sun   red                2
         2 sun   blue  Y            2
SQL> /
Enter value for order_number: 3
old  19:        where  order_number=&order_number)
new  19:        where  order_number=3)
no rows selected
SQL> Nicolas.