SQL Server - 如何显示最近的记录

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，选择应返回以下内容：

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

Pelase帮助我处理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