How to get the number of days in a month of belonging to a range of dates

Hi, I'm going crazy around a problem, I have 2 dates and one month I wanto to retrieve the number of days belonging to the months that fall within the range.

for example:

month of January 2011. begin_date = January 11, 2011, May 30, 2011 end_date result is 21
month of January 2011. begin_date = December 11, 2010, result of end_date, January 10, 2011 10
month January 2011 .begin_date = 2 February 2011, end_date may 25, 2011 result 0
month of January 2011. begin_date = January 3, 2011, January 5, 2011 result DATE END 3

and so on...

I appreciate any suggestion
Thank you


Andrea

Something like that... ?

SQL> with t as
  2  (select  to_date('11/01/11','dd/mm/yy') from_dt,
  3           to_date('30/05/11','dd/mm/yy') to_dt,
  4           'Jan-11' mnth from dual)
  5  select least(last_day(to_date(mnth,'Mon-yy')),to_dt) -
  6         greatest(to_date(mnth,'Mon-yy'),from_dt) cnt
  7  from t  ;

       CNT
----------
        20

If 0 is also expected...

SQL> with t as
  2  (select  to_date('11/01/11','dd/mm/yy') from_dt,
  3           to_date('30/05/11','dd/mm/yy') to_dt,
  4           'Jan-11' mnth from dual union all
  5           select  to_date('11/01/11','dd/mm/yy') from_dt,
  6           to_date('30/05/11','dd/mm/yy') to_dt,
  7           'Jan-12' mnth from dual
  8           )
  9  select from_dt,to_dt,mnth,
 10         greatest(
 11              least(last_day(to_date(mnth,'Mon-yy')),to_dt)
 12              -
 13              greatest(to_date(mnth,'Mon-yy'),from_dt)
 14                 ,0) cnt
 15  from t;

FROM_DT   TO_DT     MNTH          CNT
--------- --------- ------ ----------
11-JAN-11 30-MAY-11 Jan-11         20
11-JAN-11 30-MAY-11 Jan-12          0

Published by: JAC on February 9, 2012 19:22

Tags: Database

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