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

Databases Reporting with SQL Aggregate and Numeric Functions Summing Values

SUM()

We're in a movie database. There's a reviews table with the columns of id, movie_id, username, review and rating.

The movie "Starman" has the id of 6. Movie ids are found in the movie_id column in the reviews table. Write a query that totals up all ratings for the movie "Starman" in the reviews table. Alias it as starman_total_ratings.

I it says i need a where clause, but i don't know where. Any advice?

SELECT SUM(movie_id) AS starman_total_ratings FROM reviews GROUP BY id;

1 Answer

Mark Sebeck
MOD
Mark Sebeck
Treehouse Moderator 37,799 Points

hi Caleb. You are close. You want to sum the rating not the movie id. You don't need a group by clause but you need a where movie_id = 6 to get just the movies with ID of 6

thank you ;)