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Guilherme Ferreira
1,769 Pointswhere with aggregate functions
I'm receiving the message that the where clause is missing, but the task said to find the sum of a value, which tells me that I need to use the having keyword, right?
4 Answers
Steven Parker
231,236 PointsThis is an example of what I was talking about previously. The WHERE clause will be used to determine which rows participate in the aggregate (just those for that particular movie). You don't need to include "movie_id" in the SELECT clause, and you also won't need a GROUP BY or a HAVING.
Guilherme Ferreira
1,769 PointsThe link is: https://teamtreehouse.com/library/reporting-with-sql/aggregate-and-numeric-functions/summing-values
Task: 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.
That's the query I tried: SELECT SUM(rating) AS starman_total_ratings, movie_id FROM reviews GROUP BY movie_id HAVING movie_id = 6;
Guilherme Ferreira
1,769 PointsI tried: SELECT SUM(rating) AS starman_total_ratings FROM reviews WHERE movie_id = 6; but I'm still got an error that says "You should try writing a SELECT query".
Steven Parker
231,236 PointsLooks right to me. So I copied and pasted that query directly into the challenge ... and it passed. Try again?
Guilherme Ferreira
1,769 PointsNow it passed! Seens like a bug, there was a whitespace before the SELECT and that return an error