MySQL的：使用行的子集，以覈對where子句

Question

我有一個表是這樣的：

---------------------------------------- 
|uID|responseDate|field_01|field_02|etc| 
+---+------------+--------+--------+---+ 
| 1 | 2011-12-02 | yes | no | | 
| 2 | 2011-11-25 | no | yes | | 
| 1 | 2012-01-02 | no | yes | | 
| 2 | 2012-12-01 | no | no | | 
| 3 | 2010-01-02 | yes | no | | 
+---+------------+--------+--------+---+ 

我想獲得UID和responseDates爲誰field_01的最新迴應是肯定的 - 所以我的查詢應該返回：

------------------ 
|uID|responseDate| 
+---+------------+ 
| 3 | 2010-01-02 | 
+---+------------+ 

我使用的是內部聯接，但不正確。這裏是我的查詢：

SELECT f.uID, f.responseDate 
FROM form_05 as f 
INNER JOIN (
    SELECT uID, max(responseDate) AS latest_date 
    FROM form_05 
    WHERE field_01 = 'yes' 
    GROUP BY uID) dmax 
ON dmax.uID = f.uID and dmax.latest_date = f.responseDate 
ORDER BY f.uID ASC; 

這是什麼返回，但是，對每個UID其中field_01是肯定的，即：

------------------ 
|uID|responseDate| 
+---+------------+ 
| 1 | 2011-12-02 | 
| 3 | 2010-01-02 | 
+---+------------+  

最新的條目，但我不希望這樣。我想這樣做只有每個uID的最新條目纔有資格參加測試。我如何重構查詢？任何指針都非常感謝。

Answer 1

試試這個，讓我知道，如果它不工作：

select t2.uid, t2.responseDate from t2 
left join (
    select t1.uid, max(t1.responseDate) as MaxDate from t1 
    group by t1.uid 
) as SubQuery on t2.uid = SubQuery.uid and t2.responseDate = SubQuery.MaxDate 
where MaxDate is not null and field_01 = "yes"