Question

我在SQL Server中有一个表。

ID PID LASTMODIFIED REASON
1  1   01/01/2011   XYZ
2  1   04/01/2011   XYY
3  2   05/01/2011   ZZZ
4  2   03/01/2011   ABC

我想为每个PID选择基于MAX（LASTMODIFIED）的行。对于EX，select应返回以下内容：

ID PID LASTMODIFIED REASON
2  1   04/01/2011   XYY
3  2   05/01/2011   ZZZ

Pelase帮我解决了SQL语句。谢谢。

Answer 1

SELECT A.ID, A.PID, A.LastModified, A.Reason 
FROM MyTable AS A INNER JOIN (
SELECT PID, MAX(LastModified) AS MaxDate
FROM MyTable
GROUP BY PID) AS B ON A.PID = B.PID AND A.LastModified = B.MaxDate

SQL Server - 如何显示最新记录

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