范例1:
表test1的一部分:
name|mygroup| scale
----------------
ben | 1 | 1
tom | 1 | 2
jim | 2 | 1
tim | 2 | 2
..
输出应为:
name|mygroup| scale
----------------
ben | 1 | 1
jim | 2 | 1
我尝试:
select name,mygroup,min(scale) from test1 group by mygroup;
但它没有给出正确的输出。
谢谢
最佳答案
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