gruop获取表的最大值

Question

我是一种新的SQL，现在我试图让每个组（GRP）的最佳平均数，我有这张表。

Table1

我正在tryng得到这样的事情，但林不知道该怎么办呢

expected table

Answer 1

select * 
from (
     select dense_rank() over (partition by grp order by g_avg desc) as rn 
     ,  * 
     from (
       select sid 
       ,  grp 
       ,  first 
       ,  last 
       ,  avg(points) as g_avg 
       from YourTable 
       group by 
         sid 
       ,  grp 
       ,  first 
       ,  last 
       ) 
     ) 
where rn = 1