Query Question

So if I have a DB like this:

uid grade
1 8
2 7
3 9
4 3
1 5
2 3
3 2
4 1

How can I get a query that will return the UID with the HIGHEST AVERAGE GRADE?

select uid,
       avg(grade) g
  from t
 group
    by uid
 order
    by g desc
 fetch 1 row only

Change table name as apropriate.

Depending on which DBMS you are using you may need to change the fetch clause.

Thanks!