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Databases Reporting with SQL Aggregate and Numeric Functions Summing Values

Posted by Caleb Newell
Caleb Newell
12,562 Points

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?

Caleb Newell
Caleb Newell
12,562 Points 
SELECT SUM(movie_id) AS starman_total_ratings FROM reviews GROUP BY id;

1 Answer

Mark Sebeck
MOD
Mark Sebeck
Treehouse Moderator 37,836 Points
Mark Sebeck
Mark Sebeck
Treehouse Moderator 37,836 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

Caleb Newell
Caleb Newell
12,562 Points

thank you ;)