從每個projid中imgid是最大的表中選擇所有

Question

SELECT * FROM projimg WHERE imgid = (SELECT MAX(imgid) FROM projimg) 

我知道上面的查詢只會在我嘗試時返回1個值。

我希望得到所有最大imgid每PROJID ..

imgid | projid | 
    1  1 
    2  1 
    3  2 
    4  2 
    5  4 
    6  4 

例如，對於

PROJID = 1，我得到imgid = 2
PROJID = 2，我得到imgid = 4
PROJID = 4，我得到imgid = 6
等等...

結果是象下面這樣：

imgid | projid 
    2  1 
    4  2 
    6  4 

Answer 1

SELECT * FROM projimg 
WHERE imgid IN ( 
    SELECT MAX(imgid) 
    FROM projimg 
    group by projid) 

小提琴：http://sqlfiddle.com/#!2/b4f71/2

Answer 2

試試這個：

SELECT projid, MAX(imgid) as imgid 
    FROM projimg 
group by projid 

Answer 3

SELECT projid, MAX(imgid) as finalResult 
FROM projimg 
GROUP BY projid