Date diff for oracle 9i

Hi Guys,
I'm new in oracle... I'm using oracle in cf application now.
Oracle 9i.
Now i want to display records for 6 months. How to use
datediff function in oracle?
My query will like this
Select * from tblname
Where datediff(now(),fielddate) <= 6.
Any one use oracle? Please help me on this.
Thank in advance,
Regards
Shaffiq

You might want to use "where fielddate > SYSDATE - 180,
but 180 is just an approximation in days of 6 months and won't be
exact. I use 8i, but aside from outer joins, they're very similar.
I highly recommend this page:
http://www.techonthenet.com/oracle/index.php

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Date diff for oracle 9i

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