Difference in days between 2 dates Oracle SQL

Question

Alright, so I\'ve checked many many many other posts on stackoverflow to see if this is mentioned anywhere, and the answers provided don\'t quite make sense to me...I\'m thinkin

Answer 1

The easeyest way of doing this is writing a function in oracle like DATEDIFF in mysql, id done this like :

function        datediff( p_what in varchar2, p_d1 in date, p_d2 in date) return number as  l_result    number; 
BEGIN
      select (p_d2-p_d1) * 
             decode( upper(p_what), 'SS', 24*60*60, 'MI', 24*60, 'HH', 24, NULL ) 
       into l_result from dual; 

      return l_result; 

END;

and call this function like :

DATEDIFF('YYYY-MM-DD', SYSTIMESTAMP, SYSTIMESTAMP)

in your sql command