选择一天中最大记录
Ricky
posted @ 2015年7月02日 11:33
in Other
, 938 阅读
select s1.*
from sensorTable s1
inner join
(
SELECT sensorID, max(timestamp) as mts
FROM sensorTable
GROUP BY sensorID
) s2 on s2.sensorID = s1.sensorID and s1.timestamp = s2.mts
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