我有一个不包含唯一列的表
id | fid | ver | dir
1 || 1 || 1 || 3
2 || 2 || 1 || 2
3 || 3 || 1 || 3
4 || 3 || 2 || 3
5 || 4 || 1 || 4
6 || 5 || 1 || 5
我的问题是如何在dir = 3中选择最新fid的ID(基于ver)
我尝试了
(SELECT
id FROM
table WHERE
dir ='3' GROUP BY
fid ORDER BY
version )
,但这给了我id
1
3
这不是我想要得到的结果。这是我期望得到的结果:
id
1
4
最佳答案
select id
from myTable t1
where dir = 3
and not exists (
select 1
from myTable t2
where t1.version < t2.version
and t1.dir = t2.dir
and t1.fid = t2.fid
)
order by version
关于mysql - MySQL组按降序排列,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/25228442/