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Old 07-16-2004, 12:58 PM  
M_M
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Join Date: May 2004
Posts: 1,167
SELECT t1.campaign_id, t2.revenue FROM table1 t1 LEFT JOIN table2 t2 ON t1.campaign_id=t2.campaign_id WHERE (t2.year=2004 AND t2.month=12) OR t2.campaign_id IS NULL
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