获取最后一个副本

我的问题是，因为人们对我们的运输订单犯了错误，并且创建了另一个追踪＃来修正订单，因此存在欺诈行为。所以我总是需要得到订单的最后一个副本，所以我得到正确的跟踪＃。获取最后一个副本

我已经试过这样：

SELECT OrderNum, TrackingNumber, CreatedDate, CreatedBy, Carrier 
FROM FPDWDB1.Ship.dbo.ShippingLog 
GROUP BY OrderNum

我收到以下错误：

Column 'FPDWDB1.Ship.dbo.ShippingLog.TrackingNumber' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

来源

2016-06-14 Chris Rosenau

如果使用GROUP BY，所有其他列以外该组需要被用在一个聚合函数中，即max，avg等等。它听起来像像你需要一个row_number（），它是决定最新记录的CreatedDate？ – artm

Select OrderNum, TrackingNumber, CreatedDate, CreatedBy, Carrier 
FROM (
SELECT OrderNum, TrackingNumber, CreatedDate, CreatedBy, Carrier 
     ,ROW_NUMBER() OVER (PARTITION BY OrderNum ORDER BY CreatedDate DESC) rn 
FROM FPDWDB1.Ship.dbo.ShippingLog 
) A Where rn = 1

WITH A AS (
SELECT OrderNum, TrackingNumber, CreatedDate, CreatedBy, Carrier 
     ,ROW_NUMBER() OVER (PARTITION BY OrderNum ORDER BY CreatedDate DESC) rn 
FROM FPDWDB1.Ship.dbo.ShippingLog 
) 
Select OrderNum, TrackingNumber, CreatedDate, CreatedBy, Carrier 
FROM A 
Where rn = 1

来源

2016-06-15 00:36:17

获取最后一个副本

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