於最大日期每組

Question

列更新標誌想象一下如下表：

Id  type  created      flag 
----------------------------------------------------- 
1   1  2015-12-11 12:00:00   0 
2   1  2015-12-11 12:10:00   0 
3   2  2015-12-11 12:00:00   0 
4   2  2015-12-11 12:10:00   0 
5   3  2015-12-11 12:00:00   0 
6   3  2015-12-11 12:10:00   0 
-------------------------------------------------------- 

我想寫這將標誌設置爲1（TRUE）的每一行的查詢與最近的創建日期爲每種類型分組。當然，結果應該是：

Id  type  created      flag 
----------------------------------------------------- 
1   1  2015-12-11 12:00:00   0 
2   1  2015-12-11 12:10:00   1 
3   2  2015-12-11 12:00:00   0 
4   2  2015-12-11 12:10:00   1 
5   3  2015-12-11 12:00:00   0 
6   3  2015-12-11 12:10:00   1 
-------------------------------------------------------- 

我知道

UPDATE table 
SET flag = TRUE 
ORDER BY created DESC 
LIMIT 1; 

將設置標誌最近的日期，但我堅持就如何應用此爲每個組。

我也試過：

UPDATE table t 
INNER JOIN 
    (SELECT id, flag, MAX(created) as maxdate 
    FROM table 
    GROUP BY type) as m 
SET flag = TRUE 
WHERE m.id = t.id AND t.created = m.maxdate; 

Answer 1

也許嘗試這樣的事：

UPDATE table SET flag = 1 
WHERE id IN(SELECT id FROM(SELECT id, type FROM table 
ORDER BY created DESC) AS t GROUP BY type t.type);