On Tue, 13 May 2003, Steve Crawford wrote:
> How about:
>
> select to_char(finish-start, 'HH24:MI:SS') from timetable;
> to_char
> ----------
> 00:01:29
>
> This won't work if the interval is > 24 hours - you would have to add
> formatting to allow for days.
>
... which is exactly my problem.