如何僅在mysql中獲取min組行？

Question

例1：

表test1的一部分：

name|mygroup| scale
----------------
ben | 1   | 1
tom | 1   | 2
jim | 2   | 1
tim | 2   | 2
..

輸出應為：

name|mygroup| scale
----------------
ben | 1   | 1
jim | 2   | 1

我嘗試：

select name,mygroup,min(scale) from test1 group by mygroup;

但它沒有給出正確的輸出。

謝謝

Answer 1

SELECT t.name, t.mygroup, t.scale
    FROM test1 t
        INNER JOIN (SELECT mygroup, MIN(scale) AS MinScale
                        FROM test1
                        GROUP BY mygroup) q
            ON t.mygroup = q.mygroup
                AND t.scale = q.MinScale