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SELECT * FROM (SELECT * FROM T_Life_Message z WHERE z.message_id NOT IN(SELECT u.message_id FROM T_Life_UMessage u WHERE u.account=‘18922234293‘ AND u.isdelete=1) AND message_status=1) AS M LEFT JOIN (SELECT u.message_id,u.isread FROM T_Life_UMessage u) AS N ON M.message_id=N.message_id
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原文地址：http://www.cnblogs.com/JAYIT/p/4176589.html
