Maybe this?
SELECT d.ID
FROM DATA d
LEFT OUTER JOIN NEW_DATA n ON n.CODE = d.CODE AND n.CNAME=d.CNAME
GROUP BY ID
HAVING COUNT(*) = COUNT(n.CNAME);
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Deja View - The strange feeling that somewhere, sometime you've optimised this query before
How to get the best help on a forum
http://www.sqlservercentral.com/articles/Best+Practices/61537