选择具有多个关联字段的字段

Question

下面是示例VIEW_TEST表，我要从中选择与1个以上曲目相关联的deviceId。例如。第100个设备与FirstTrack和SecondTrack相关联，因此应选择

我尝试了很多事情，但无法获得答案。以下是我尝试过的查询，但未返回任何内容

select deviceid
from ( SELECT  distinct deviceid, trackid , count (distinct deviceid) over (partition by trackid) as cnt 
    FROM VIEW_TEST) t
    where cnt > 0;

当我在内部查询下执行时，

SELECT  distinct deviceid, trackid , count (distinct deviceid) over (partition by trackid) as cnt 
    FROM VIEW_TEST

它给了我以下输出

Answer 1

您不需要使用窗口功能，而是可以使用：

select t.*
from VIEW_TEST t
where exists (select 1 from VIEW_TEST t1 where t1.deviceid = t.deviceid and t1.trackid <> t.trackid);

您还可以使用group by子句：

select deviceid
from VIEW_TEST t
group by deviceid
having min(trackid) <> max(trackid); 

但是，COUNT(DISTINCT trackid)也会有所帮助：

select deviceid
from VIEW_TEST t
group by deviceid
having count(distinct trackid) > 1;