Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial![](https://ecs-static.teamtreehouse.com/assets/views/marketing/shared/community-banner-white-47072046c51352fe6a69f5e691ff5700b28bb11d45197d7bdf066d9ea3f72d0c.webp)
![Jonathan Weinstein](https://uploads.teamtreehouse.com/production/profile-photos/1983222/micro_Jonathan_JPEG.jpg)
Jonathan Weinstein
9,063 PointsTrouble creating OUTER JOIN
Having trouble completing the following challenge task:
Select the average "score" as "average", setting to 0 if null, by grouping the "movie_id" from the "reviews" table. Also, do an outer join on the "movies" table with its "id" column and display the movie "title" before the "average". Finally, filter out any "average" score over 2.
SELECT AVG(score), IFNULL(AVG(score),0) AS average FROM reviews LEFT OUTER JOIN reviews ON movies.id GROUP BY movie_id HAVING average <= 2;
Anyone have guidance?
Thanks!
2 Answers
![Leonardo Hernandez](https://secure.gravatar.com/avatar/40d4665f71e89db6aa2b952d812cfdd2?s=96&d=https%3A%2F%2Fecs-static.teamtreehouse.com%2Fassets%2Fcontent%2Fdefault_avatar-445fbbabfc8dc9188fb5967fe43322ee0c3e0dd1e10f378bf8343784af5a13eb.webp&r=pg)
Leonardo Hernandez
13,798 PointsThe first problem I see is you haven't selected the "'title' before the 'average' " After your 'SELECT' fit title in there and add a comma after it.
Next, select score as you did in the question before, with the average function, and setting AS average. Then wrap it all in the IFNULL function like below. (You selected score twice.)
IFNULL(AVG(score), 0) AS average)
Your join needs work too. This question has you select FROM movies as opposed to the previous two questions that had you select from reviews. It was a bit confusing.
FROM movies LEFT OUTER JOIN reviews ON movies.id = reviews.movie_id
Finish it off with the GROUP BY and HAVING directions.
![Antonio Nicasio](https://uploads.teamtreehouse.com/production/profile-photos/4576272/micro_10897900_906016956089139_8474385882608686145_n.jpg)
Antonio Nicasio
Courses Plus Student 3,601 PointsSELECT movies.title, IFNULL(AVG(score),0) AS average FROM reviews RIGHT OUTER JOIN movies ON movies.id = reviews.movie_id GROUP BY movie_id HAVING average <= 2;