How to calculate the no. of weekdays between two active dates

Hi all,
I need to calculate the no. of weekdays between two days.
For Example:
If i want to know the number of weekdays between 17-NOV-2008 to 7-DEC-2008 its 10 excluding sat and sun.
how to do that if the period is more?
like 1-JAN-2006 to 12-APR-2007
Thanks in advance..
Regards,
Manoj

NEXT_DAY(start_date - 1,'SUNDAY') is first sunday >= start_date. NEXT_DAY(end_date - 7,'SUNDAY') is last Sunday <= end_date. Therefore:
(NEXT_DAY(end_date - 7,'SUNDAY') - NEXT_DAY(start_date - 1,'SUNDAY')) / 7 + 1 is number of Sunday's between start_date and end_date. Same way:
(NEXT_DAY(end_date - 7,'SATURDAY') - NEXT_DAY(start_date - 1,'SATURDAY')) / 7 + 1 As a result, number of weekdays between start_date and end_date is:
business_day_count := end_date - start_date + 1 -((NEXT_DAY(end_date - 7,'SUNDAY') - NEXT_DAY(start_date - 1,'SUNDAY')) / 7 + 1 + (NEXT_DAY(end_date - 7,'SATURDAY') - NEXT_DAY(start_date - 1,'SATURDAY')) / 7 + 1) or
business_day_count := end_date - start_date - 1 -(NEXT_DAY(end_date - 7,'SUNDAY') - NEXT_DAY(start_date - 1,'SUNDAY')) / 7 - (NEXT_DAY(end_date - 7,'SATURDAY') - NEXT_DAY(start_date - 1,'SATURDAY')) / 7 or:
SELECT end_date - start_date - 1 -(NEXT_DAY(end_date - 7,'SUNDAY') - NEXT_DAY(start_date - 1,'SUNDAY')) / 7 - (NEXT_DAY(end_date - 7,'SATURDAY') - NEXT_DAY(start_date - 1,'SATURDAY')) / 7 FROM DUAL; The above code assumes business day count between two dates includes both start and end dates. Keep in mind, the above code is NLS dependent.
SY.

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