SQL Query not getting the corresponding column

Question

SELECT t.title, Max(t.st) 
FROM (SELECT title, 
               Avg(stars) AS st 
        FROM movie 
               JOIN rating USING(mid) 
        GROUP BY title)t;

This is my query which I am writing to get max values of AVG(stars) and it's corresponding title. Max value is coming fine but facing trouble in title. I am not getting corresponding title.

Output of subquery is:

Avatar                  4.0
E.T.                    2.5
Gone with the Wind      3.0
Raiders of the Lost Ark 3.33333333333
Snow White              4.5
The Sound of Music      2.5 

Output of whole query is wrong .

The Sound of Music 4.5

Expected /Correct output is

SnowWhite 4.5

Answer 1

Try this

select t.title,
       t.st
  from 
(select title,
        avg(stars) as st,rank() over(order by avg(stars) desc) as rSt
   from movie 
   join rating using(mID)
  group by title)t where t.rSt=1  ;

It is ranking movies in descending order first, then in outer query's where condition, movie with highest rank is being selected. Hope this helps :-)

Answer 2

You can try using correlated subquery

select *
from 
(select title,
        avg(stars) as st
   from movie  a
   join rating b on a.mID=b.mID
  group by title
)t where st in
  (select max(st) from (select title,
        avg(stars) as st
   from movie  a
   join rating b on a.mID=b.mID
   group by title
  )t1 on t.title=t1.title)

Answer 3

You can use WHERE condition in your query. You can experiment with joins or just use subquery.

Select title, max(stars) 
from table 
where stars = (select max(stars) from table)

or

SELECT top 1 title
FROM table
ORDER BY Stars DESC