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Development Tools Database Foundations SQL Calculating, Aggregating and Other Functions Grouping, Joining and Cleaning Up

What is the difference in syntax in Task 3 of 3 in the Grouping, Joining and Cleaning Up?

Why did the syntax movies.title not pass in Task 3 of 3 in the Challenge: Grouping, Joining and Cleaning Up? The small change of just title DID pass.

My first attempt that didn't pass:

SELECT movies.title, IFNULL(AVG(score), 0) AS average
FROM reviews RIGHT OUTER JOIN movies 
ON reviews.movie_id = movies.id 
GROUP BY movie_id 
HAVING average < 2;

Second attempt that did pass:

SELECT title, IFNULL(AVG(score), 0) AS average 
FROM reviews RIGHT OUTER JOIN movies 
ON reviews.movie_id = movies.id 
GROUP BY movie_id 
HAVING average < 2;

I'm use to small changes making a difference, but I thought movies.title would be an accepted alternate way to SELECT a column.