电影评分中位数 >= 8 的前两位演员是谁？

Question

SELECT n.name as actor_name , COUNT(r.movie_id) as movie_count
FROM names as n
INNER JOIN director_mapping as dm
ON n.id = dm.movie_id
INNER JOIN movie as m
ON dm.movie_id = m.id
INNER JOIN ratings as r
ON m.id = r.movie_id
WHERE r.median_rating >= 8 
GROUP BY actor_name
ORDER BY movie_count DESC
LIMIT 2;

It gives nothing in result, could anyone please help?

Answer 1

Your join on director_mapping was wrong and the column you joined on too:

SELECT n.name as actor_name , COUNT(r.movie_id) as movie_count
FROM names as n
INNER JOIN role_mapping as rm ON n.id = rm.name_id
INNER JOIN movie as m ON m.id = rm.movie_id
INNER JOIN ratings as r ON m.id = r.movie_id
WHERE r.median_rating >= 8 
GROUP BY actor_name
ORDER BY movie_count DESC
LIMIT 2;