Help needed for function

Hi All,
Display     Setting setval display1 display2
D1     0 0 d1 d2
D1 1 0 d1_1 null
D1 1 1 null d2_1
D1 1 2 null d2_2
Based on settting and setval values we will get the
above rows,(Here setting =0 setval=0 combination is the default).
display1:-
Let say for settting=1,setval=1 first check for display1 value
if it is null then check for setting=1,setting=0 if this is also null
then we need to return display1 value for setting=0,setval=0.
For setting=1,setval=1 the output is d1_1, and similarly
for setting=1,setval=1 the output for display2 is d2_1.
Please suggest how to implement this logic through functions,
because the output of display1,display2----display-n we need to
use in SQL queries.
Thanks,
Arvind

As I said above, the first_value function with ignore nulls expression won't work in 9.2.
So, you need to add some modification to achieve what do you want :
SQL> with tbl as
  2  (select 'D1' Display,  0 Setting , 0 setval , 'd1' display1,  'd2' display2 from dual
  3   union all
  4   select 'D1' , 1, 0, 'd1_1', null from dual
  5   union all
  6   select 'D1' , 1, 1, null, 'd2_1' from dual
  7   union all
  8   select 'D1' , 1, 2, null, 'd2_2' from dual)
  9  select display, max(fv_d1) display1, max(fv_d2) display2
10  from
11  (select display,
12          first_value(display1)
13                over (partition by display order by decode(display1,null,0,1) desc, setting desc, setval desc) fv_d1,
14          first_value(display2)
15                over (partition by display order by decode(display2,null,0,1) desc, setting desc, setval desc) fv_d2
16   from   tbl
17   where  (setting=1 and setval=1)
18   or     (setting=1 and setval=0)
19   or     (setting=0 and setval=0))
20  group by display;
DI DISP DISP
D1 d1_1 d2_1
SQL> select * from v$version where rownum=1;
BANNER
Oracle9i Enterprise Edition Release 9.2.0.8.0 - Production
SQL> Nicolas.

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