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 trialDai Phong
20,395 PointsProblem with sql command
I'm stuck on a sql:
Like before, 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.
and my command is:
SELECT movies.title, IFNULL(AVG(score), 0) AS average FROM reviews LEFT OUTER JOIN movies ON reviews.movie_id = movies.id GROUP BY reviews.movie_id HAVING average < 2
But when I hit enter command, it display something wrong but still show the query result. Help me please.
1 Answer
Jeff Busch
19,287 PointsHi Dai,
Try this:
SELECT title, IFNULL(AVG(score),0) AS average FROM movies LEFT OUTER JOIN reviews ON movies.id = reviews.movie_id GROUP BY movie_id HAVING average <= 2;