SQL to return the number of working days between 2 passed in dates

Question

I need to write an sql query that returns the number of Working days (Monday - Friday) between two given dates.

I was wondering what would be the most efficient way

Answer 1

It can be achieved by:

select  SUM(decode ( to_CHAR((sysdate-ROWNUM),'DY'),'SUN',0,'SAT',0,1)) from all_objects where rownum < sysdate -  (sysdate -9)