最大电影的评级排名是多少？

Question

您好我有以下数据模型。

我需要找到最大电影所属评级的排名。 我写了以下查询，我的教练告诉我这是错误的。

SELECT
  COUNT(DISTINCT r.movieratingid) AS rank
FROM
  Rating r JOIN movie m ON r.movieratingid = m.rating_movieratingid
GROUP BY count(distinct r.movierating)
HAVING count(m.movieid) = (SELECT sum(m1.movieid) from movie m1
Where m.movieid = m1.movieid)

请告诉我上述查询有什么问题。

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• 电影桌

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• 评级表

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Answer 1

这将按照该评级的电影数量的降序显示评级。

SELECT r.movierating, COUNT(r.movieratingid) AS rank
FROM
Rating r 
INNER JOIN movie m ON r.movieratingid = m.rating_movieratingid
GROUP BY count(r.movierating) order by 2 desc

Answer 2

我不确定我完全理解你......你可以试试这个

SELECT movierating, COUNT(r.movieratingid) AS rank
FROM
Rating r 
INNER JOIN movie m ON r.movieratingid = m.rating_movieratingid
GROUP BY r.movierating