通過MySql中的第一個查詢分組

Question

我需要將以下內容（sql in access）轉換爲mysql。它是第一個查詢的組，但obv mysql不能處理第一個或最後一個。

SELECT First([20121202].Date) AS FirstOfDate, First([20121202].Time) AS FirstOfTime, [20121202].HomeMatchingId, [20121202].AwayMatchingId, [20121202].RunningStatus 
FROM 20121202 
GROUP BY [20121202].HomeMatchingId, [20121202].AwayMatchingId, [20121202].RunningStatus 
HAVING ((([20121202].RunningStatus)=1)) 

基本上我在這遊戲（hometeam v awayteam）變爲重放時後（runningstatus = 1）

在此先感謝

Answer 1

不知道的日期是什麼，但那麼使用常規聚合體呢？

SELECT 
    MIN(`Date`) AS `FirstOfDate`, 
    MIN(`Time`) AS `FirstOfTime`, 
    `HomeMatchingId`, 
    `AwayMatchingId`, 
    `RunningStatus` 
FROM `20121202` 
GROUP BY 
    `HomeMatchingId`, 
    `AwayMatchingId`, 
    `RunningStatus` 
HAVING 
    `RunningStatus`=1 

Answer 2

我認爲first的目的是爲了得到最早的日期。如果在每個日期最一行，那麼你可以做：

SELECT t.Date AS FirstOfDate, t.Time AS FirstOfTime, 
     t.HomeMatchingId, t.AwayMatchingId, t.RunningStatus 
FROM `20121202` t join 
     (select HomeMatchingId, AwayMatchingId, min(date) as mindate 
     from `20121202` 
     WHERE RunningStatus = 1; 
     group by HomeMatchingId, AwayMatchingId 
    ) tmin 
     on t.date = tmin.date and t.HomeMatchingId = tmin.HomeMatchingId and 
     tmin.AwayMatchingId and t.AwayMatchingId and 
WHERE RunningStatus = 1; 

我提出RunningStatus條件的where條款，因爲這是更有效的。