SQL嵌套聚合函数

Question

我正在尝试在数据库中获得最低的电影平均评分。

目前我有：

select movie.movietitle as "Lowest Average Rating"
from movie, rating 
where movie.movieid = rating.movieid
group by movie.movietitle
having avg(rating.rating) = min(avg(rating.rating));

但是我收到错误消息“组函数嵌套太深”。 谁能为我提供正确的方法，并解释为什么此方法不起作用？

谢谢

Answer 1

SELECT MOVIETITLE AS "Movie Title", AVG(RATING) AS "Lowest Average Rating"
FROM MOVIE, RATING
WHERE MOVIE.MOVIEID = RATING.MOVIEID
GROUP BY MOVIETITLE
HAVING AVG(RATING) =
(
    SELECT MIN(AVG(RATING)) AS "AVGRating"
    FROM MOVIE, RATING
    WHERE MOVIE.MOVIEID = RATING.MOVIEID
    GROUP BY MOVIETITLE
)

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• SQLFiddle演示（ 简单示例 ）