SQL嵌套聚合函數

Question

我試圖獲得數據庫中影片的最低平均評分。

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)); 

但我得到的錯誤「組函數嵌套太深。」 任何人都可以提供一個正確的方式來做到這一點，並解釋爲什麼這不起作用？

感謝

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 Demo (simple example)