Oracle equivalent to DATEPART()?

Does Oracle have an equivalent to Sybase's DATEPART function? Please don't flame me, I've only used Sybase. Ideally, what I want to do is group by months of a year or by hours of a day, something like:

select datepart(hour, itemtime), count(items) from tablename
group by datepart(hour, itemtime)

How should I do this in Oracle? Can I use casting of the timestamp?

Thanks,
John

  xwhiz_at_netcom.com Received on Thu Jul 07 1994 - 01:03:00 CEST