How to delete one record out the two?

Hi all,
A have an Orders table:
ACCOUNT, ORDER_NO, ORDER_DATE
I have a few cases where there two accounts have the same ORDER_NO. I dont think this is right in a traditional Orders/ Orderline relationship!
For Example:
ACCOUNT     ORDER_NO     ORDER_DATE
WYM01     O15506     01/09/2004
DA4060     O15506     01/09/2004
What is the best way to delete one of these? There are quiet a few so I was looking into cursors.
Thanks

You can do it like this
DELETE
FROM orders
WHERE ROWID IN ( SELECT row_id
                    FROM (SELECT ROWID       row_id
                                ,ROW_NUMBER () OVER ( PARTITION BY order_no
                                                          ORDER BY ROWID
                                                    ) row_num
                            FROM orders
                   WHERE row_num <> 1
                );Regards
Arun

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