Please use a relevant subject for your posts.
On Tue, Feb 08, 2005 at 23:14:57 +0530,
Surabhi Ahuja <surabhi.ahuja@iiitb.ac.in> wrote:
> i have a table in which duplicate rows occur.
>
> now i have to remove the duplicates. Please note that however, only the duplicate rows have to be deleted and not the
originalone.
>
> How do i do it?
If the table has oids, then you can delete all but the row with the minimum
oid for each set of duplicates.
Another option is to do a select distinct into a temp table, a delete and
then copy the temp table back.
You should also add a constraint so that duplicates can't get back into
the table once you have it cleaned up.