TSQL選擇每個合同的第一個和最後一個條目

我有一個歷史表，其中每當合同表發生變化時都會寫入該表。現在我必須知道每個合同的第一個和最後一個條目。我有一個helpertable所有合同加入。從表TSQL選擇每個合同的第一個和最後一個條目

樣本數據sk_vps_all

contract_id, lastchange, other_id(ignore this) 
    39865537 21 Oct 2014 12:15:03.073PM  8386311 
    39865537 21 Nov 2014 19:55:55.363PM  8386311 
    39865537 21 Nov 2014 20:02:22.176PM  8386311 
    39865537 21 Nov 2014 20:13:30.236PM  8386311 
    39865537 27 Nov 2014 14:59:34.900PM  8386311 
    39865537 27 Nov 2014 14:59:45.973PM  8386311 
    39865537 2 Aug 2016 12:42:31.570PM  8386311 
    39868261 20 Feb 2006 21:31:44.533PM   NULL 
    39868261 20 Feb 2006 21:31:44.550PM   NULL 
    39868261 20 Feb 2006 21:31:44.616PM   NULL 
    39868261 20 Feb 2006 21:36:42.026PM  8388985 
    39868261 20 Feb 2006 21:41:32.030PM  8388985 
    39868261 20 Feb 2006 22:01:16.843PM  8388985 
    39868261 3 Aug 2010 21:34:13.030PM  8388985 
    39869226 21 Feb 2006 02:36:37.173AM   NULL 
    39869226 21 Feb 2006 02:36:37.186AM   NULL 
    39869226 21 Feb 2006 02:36:37.376AM   NULL 
    39869226 21 Feb 2006 02:41:06.043AM  8389959 
    39869226 21 Feb 2006 03:11:18.793AM  8389959 
    39869226 21 Feb 2006 03:26:22.356AM  8389959 
    39869226 21 Feb 2006 09:17:16.553AM  8389959 
    39869226 15 Oct 2008 02:08:42.213AM  8389959 
    39869226 15 Oct 2008 10:18:24.930AM  8389959 
    39869226 17 Nov 2008 01:13:16.586AM  8389959 
    39869226 17 Nov 2008 09:01:57.410AM  8389959 
    39869226 19 Jan 2009 00:54:44.686AM  8389959 
    39869226 19 Jan 2009 09:31:15.926AM  8389959 
    39869226 26 Jan 2009 01:04:50.330AM  8389959 
    39869226 27 Jan 2009 10:33:19.910AM  8389959 
    39869226 14 Jun 2010 02:07:56.230AM  8389959 
    39869226 14 Jun 2010 10:03:24.626AM  8389959

我想這一點，

select min(o.contract_id), min(o.lastchange), max(o.lastchange) 
from operators..sk_vps_all o, operators..sk_vps_ta a 
where o.contract_id = a.contract_id;

結果只有一條線，而不是所有的。

每個合同獲取第一行和最後一行數據的任何想法。我必須使用sybase上的TSQL完成此任務RDMBS

來源

2017-07-17 druuhl

對'o.contract_id'使用'GROUP BY'子句。 –

謝謝，它工作很好 – druuhl

SELECT o.contract_id 
,min(o.lastchange) 
,max(o.lastchange) 
FROM operators..sk_vps_ta a 
LEFT JOIN operators..sk_vps_all o ON o.contract_id = a.contract_id 
GROUP BY o.contract_id

來源

2017-07-17 08:30:52 Janine

TSQL選擇每個合同的第一個和最後一個條目

回答

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