基於2個列值的最後記錄

Question

pass_id retry_id 
1  1 
1  2 
2  1 
2  2 
2  3 
3  1 
3  2 

需要在MAX（pass_id）內用MAX（retry_id）選取記錄。

pass_id retry_id 
3  2 

在此先感謝！

Answer 1

SELECT * 
FROM MyTable 
WHERE 
    retry_id = (Select MAX(retry_id) FROM MyTable) AND 
    pass_id = (Select MAX(pass_id) FROM MyTable) 

Answer 2

甲骨文語法並不積極，但像

SELECT MAX(retry_ID) 
FROM Table 
WHERE Pass_ID = (SELECT MAX(Pass_ID) 
       FROM Table) 

Answer 3

最簡單的方法是用order by，只是選擇一個行：

select t.pass_id, t.retry_id 
from (select t.* 
     from t 
     order by pass_id desc, retry_id desc 
    ) t 
where rownum = 1 

Here是SQLFiddle。