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Posted by Zack Yovel
Zack Yovel
8,966 Points

Need help with sql statement.

I'm attempting the code challange at http://teamtreehouse.com/library/grouping-joining-and-cleaning-up and have a problem with the third task. Here's my sql statement so far: 

select movies.title, ifnull(avg(reviews.score),0) as average
from reviews 
left outer join movies on movies.id = reviews.movie_id
group by reviews.movie_id
having average <= 2;

could anyone point me in the right direction?

3 Answers

Gareth Borcherds
Gareth Borcherds
9,372 Points
Gareth Borcherds
Gareth Borcherds
9,372 Points

I had to play around with it a bit, but I finally got the following to work. (even though what I was putting in before was the exact same thing)

select movies.title, IFNULL(AVG(reviews.score), 0) as average 
from movies 
left outer join reviews 
on movies.id = reviews.movie_id 
group by movie_id 
having average < 2

It might have something to do with you <= instead of just <

Zack Yovel
Zack Yovel
8,966 Points

Thank Gareth, your snippet helped me find what was wrong in mine and get through this task. Here's my final statement:

select movies.title, IFNULL(AVG(reviews.score), 0) as average
from reviews
right outer join movies
on movies.id = reviews.movie_id
group by reviews.movie_id
having average < 2;
Zack Yovel
Zack Yovel
8,966 Points
Zack Yovel
Zack Yovel
8,966 Points

Problem solved.

Darren McDonald
Darren McDonald
1,481 Points
Darren McDonald
Darren McDonald
1,481 Points

Thank you both. This thread was great in helping me understand where I was going wrong in q3!

Darren.