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select s.id, t.*
from filelist as s
join (
select SensorId, FileName, count(*) as [count]
from filelist
group by SensorId, FileName
having count(*) > 1
) t on s.SensorId = t.SensorId and s.FileName = t.FileName
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原文地址：http://www.cnblogs.com/chucklu/p/5980176.html
