Re: fomatting an interval

>> Okay, so extract() doesn't fit the bill either.  How do I get the
>> difference between two timestamps in terms of days, expressed as an
>> integer?  Moreover, how do I get any interval expressed in those
>> terms?
>
>select round((extract(epoch from finish) - extract(epoch from start))/(60*60*24))
>  from timetable;

How would the following differ from the query above?

select round(extract(epoch from (finish - start))/(60*60*24)) from
timetable;