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Databases

Posted by John Vicencio
John Vicencio
6,413 Points

Huh? This doesn't work? SELECT AVG(score) AS average FROM movies GROUP BY movie_id; "error unknown column 'score'

Huh? This doesn't work? SELECT AVG(score) AS average FROM movies GROUP BY movie_id; "error unknown column 'score'

1 Answer

Steven Parker
Steven Parker
229,708 Points
Steven Parker
Steven Parker
229,708 Points

This is a bit of a guess, since you did not link to the challenge, but if you're working on the one I'm thinking of:

:point_right: There is no score column in the movies table.

If my guess is right, you're looking for data that comes from the reviews table, so you need "FROM reviews" instead of "FROM movies".

John Vicencio
John Vicencio
6,413 Points

It still didn't work... The source was https://teamtreehouse.com/library/database-foundations/sql-calculating-aggregating-and-other-functions/grouping-joining-and-cleaning-up-2

Challenge question: Group all reviews by "movie_id" and get the average "score" and alias it as "average".

My updated solution: SELECT AVG(score) AS average FROM reviews GROUP BY movie_id;

Error: Bummer! There's something wrong with your query. "error unknown column 'score'

SQL Error: Commands out of sync; you can't run this command now