我有一张表。我想获取每个独特的CoatingChambersID的最后一行。有24个独特的房间,最后一行显示房间在最后一个状态的时间。SQL:获取每个唯一标识的最后一行
我可以得到一个独特的名单像这样:
SELECT distinct CoatingChambersID, MAX(LastDT) as LastDT
FROM [REO].[dbo].[CoatingChamberStateLogs]
group by CoatingChambersID
但我无法弄清楚如何加入该回到原来的表。
在此先感谢您的帮助!
CoatingChamberStateLogsID CoatingChambersID StartDT LastDT IntervalMin CoatingChamberStatesID
1001712 1003 2017-01-24 23:09:29.8 2017-01-25 03:04:32.6758500 235.053543986667 1007
1001713 1006 2017-01-24 23:09:29.8 2017-01-25 00:30:30.8478433 81.0230772083333 1007
1001714 1015 2017-01-24 23:09:29.8 2017-01-25 04:21:33.7601011 312.071614838333 1007
1001715 1024 2017-01-24 23:09:29.8 2017-01-31 04:43:21.5643016 8973.86835151333 1001
1001716 1016 2017-01-24 23:09:29.8 2017-01-25 00:01:30.4200122 52.01594669 1006
1001717 1017 2017-01-24 23:09:29.8 2017-01-24 23:15:29.8261612 6.00604917333333 1006
1001718 1018 2017-01-24 23:09:29.8 2017-01-26 01:42:49.4040548 1593.3323474 1006 0
1001719 1019 2017-01-24 23:09:29.8 2017-01-25 02:25:32.3047026 196.047358196667 1005
1001720 1020 2017-01-24 23:09:29.8 2017-01-24 23:12:29.8009482 3.00562895666667 1007
1001721 1022 2017-01-24 23:09:29.8 2017-01-25 02:52:32.5995144 223.052271726667 1007
1001722 1023 2017-01-24 23:09:29.8 2017-01-25 03:05:32.9236594 236.057674143333 1007
1001723 1002 2017-01-24 23:09:29.4475820 2017-01-25 02:14:32.1723891 185.045413451667 1001
1001724 1004 2017-01-24 23:09:29.8 2017-01-25 00:39:31.0878194 90.02707681 1001
1001725 1005 2017-01-24 23:09:29.8 2017-01-24 23:18:29.8783565 9.006919095 1001
我添加了SQL Server标记,因为SQL看起来像SQL Server。 –
可能重复[检索每个组中的最后一条记录](https://stackoverflow.com/questions/1313120/retrieving-the-last-record-in-each-group) –