Group by a time (Or SQL Server dateadd needed in Oracle)

Hi Folks,
Got a table that has a datetime column (Lets call it sign_up_date), I want to be able to report on five minute intervals ie. break each hour into 12 5 minute intervals and then provide a count of records in each 5 minute period, like
Select 5_min_interval,count(*)
from blah
group by etc.....
I'm sure there's an easy answer but I can't see it.

I'm sure there's an easy answer but I can't see it.Because you don't [url http://forums.oracle.com/forums/search.jspa?objID=f75&q=5+minute+interval]search
Best regards
Maxim

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Oracle Migration Workbench Team:
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Group by a time (Or SQL Server dateadd needed in Oracle)

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