Question

I have this code and it gives me sold seats summarized for each movie:

SELECT mName, SUM(soldSeats)
FROM movie, show, prog
WHERE movie.movieID = prog.movieID
AND prog.showID = show.showID
GROUP BY mName 

The problem is to find movie that have the max of seats sold, I have tried to add this, but only get no rows:

HAVING SUM(soldseats) = (SELECT MAX(SUM(soldseats)) FROM show
GROUP BY solgteplasser)

Do anyone have a suggestion? Here is how the tables looks: Sum of a activity

Answer 1

Select test.* 
from 
(Select movie.mName, SUM(show.soldSeats) as soldseatsum
FROM movie, show, prog
WHere movie.movieId = prog.movieID
AND prog.showID = show.showID
Group by movie.mName
Order by soldseatsum DESC) test
Where rownum<=1

This way you order your selection descending by your SUM
and you select the first row only using Rownum
which is the row with the highest SUm.

EDIT:
Also in case you got Nulls in your SUM column make sure you add a NULLS LAST after your ORder By like this:

.....
.....
Group by movie.mName
    Order by soldseatsum DESC NULLS LAST) test
    Where rownum<=1