simple query

From: "Lyall Barbour" <lyallbarbour@xxxxxxxxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
Date: Tue, 29 Jul 2008 15:56:18 -0500

This is the only Oracle list i belong too, so, sorry if this is a little off 
topic.

Need a query that will get all the customers who have not ordered a certain 
item, ever.

Have a ORDDETAIL table that links with ORDHEADER with an ORD_NBR column.
In the ORDDETAIL table, it has a row for each item on the order.
The ORDHEADER has the CUST_CD along with the ORD_NBR.

I've tried 

SELECT a.cust_cd
FROM ordheader a, orddetail b
WHERE a.ord_nbr = b.ord_nbr
AND   b.item_cd not in (<list of items>)

but this will still bring back a record for the query if there's multiple items 
on an order and the item isn't in the list.

see what i mean? 
Can someone show me the light?
Lyall

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