在sql中查找最后一个条目

Question

我有一张这样的表：

     Id | Modified | OwnerId| Mode
    ----+----------+---------+-----
     1  | 14/01/14 |    101  | On  
     2  | 14/02/21 |    102  | Off 
     3  | 14/03/21 |    102  | On 
     4  | 14/04/21 |    102  | Off
     5  | 14/05/21 |    102  | On  
     6  | 14/05/22 |    105  | Off
     7  | 14/06/21 |    102  | Off 

我想找到每个OwnerId的最后一次出现，其中Mode等于＆＃39; Off＆＃39;像这样：

     Id | Modified | OwnerId| Mode
    ----+----------+---------+-----
     6  | 14/05/22 |    105  | Off
     7  | 14/06/21 |    102  | Off 

我将如何实现这一目标？

Answer 1

这样应该可行：

SELECT Id, Modified, OwnerId, Mode
FROM (
   SELECT Id, Modified, OwnerId, Mode,
          ROW_NUMBER() OVER(PARTITION BY OwnerId ORDER BY Modified DESC) As rn
   FROM MyTable
   Where Mode = 'Off'
) t
WHERE t.rn = 1