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Databases Reporting with SQL Aggregate and Numeric Functions Summing Values

Christopher Parke
Christopher Parke
21,978 Points

Movie Ratings Question Confusing

I'm really confused why this doesn't work.

SELECT 
        SUM(rating) AS starman_total_ratings
FROM reviews
WHERE id=6;

Or this

SELECT
             SUM(rating) AS starman_total_ratings
FROM reviews
GROUP BY movie_id
HAVING id = 6;

I feel like the wording is ambiguous.

2 Answers

Christopher Parke
Christopher Parke
21,978 Points

Oh, I got it.

The instructions say that the reviews columns include both an id, and movie_id column.

It then states: "starman has an 'id' of 6 Immediately after it states: "Movie ids are found in the movie_id column."

So instead of simply writing "starman has a movie_id of 6" he has actually misstated that starman has an id of 6, and we have no information on the movie_id of starman.

We are to assume with no knowledge that the instructor meant movie_id, when he actually said id -- and there are two distinct columns.

Steven Parker
Steven Parker
229,582 Points

You may want to report this as a bug directly to the Support staff.

Steven Parker
Steven Parker
229,582 Points

You almost had it the first time, but instead of comparing "id" with 6, you'd want to compare "movie_id" instead.