Selecting key of Days Range

Question

Hi All,
I am calculating number of days between 2 dates (dt2-dt1)+1
i have a traget table with ranges specified as
key     days_from     days_to
1     1     4
2     5     10
3     11     30
4     31     99999999999999
like....
select KEY from days_range where ( (dt2-dt1)+1
) between(DAYS_FROM,DAYS_TO)
how do i get the key after i calculate number of days, i dont want to use case statement, as my range table might grow and i will ahve to revisit the case statement.
please suggest.
thanks
Edited by: user633377 on Jun 30, 2009 7:43 AM

Answer 1

More rows added
SQL> with d as (
  2  select  to_date('01-Jan-2009','dd-Mon-yyyy') dt1,
  3     to_date('21-Jan-2009','dd-mon-yyyy') dt2  from dual union all
  4  select  to_date('01-Jan-2009','dd-Mon-yyyy') dt1,
  5     to_date('06-Jan-2009','dd-mon-yyyy') dt2  from dual union all
  6  select  to_date('11-Jan-2009','dd-Mon-yyyy') dt1,
  7     to_date('12-Jan-2009','dd-mon-yyyy') dt2  from dual
  8  ),
  9  keys as (
10  select 1 key, 1 days_from, 4 days_to from dual union all
11  select 2, 5, 10  from dual union all
12  select 3, 11, 30 from dual union all
13  select 4, 31, 99999999999999 from dual
14  )
15  select keys.*, dt2 - dt1 +1  diff
16  from d , keys
17* where dt2 - dt1 +1  between days_from and days_to
       KEY  DAYS_FROM    DAYS_TO       DIFF
         3         11         30         21
         2          5         10          6
         1          1          4          2SS