mysql - 如何删除 MySQL 查询结果中的一列？

Question

例子:

SELECT `film_id`,COUNT(film_id) AS COUNT FROM films_genres AS FilmsGenre   
WHERE genre_id In (4)  
GROUP BY film_id,COUNT 
HAVING COUNT = 1 

返回:

film_id |  COUNT
7            1   
6            1

但我希望它返回:

film_id
  7
  6

如何只返回 1 列？

Answer 1

为此，只需移动您的“COUNT(film_id)”。您的 HAVING 子句将为您完成这项工作。

SELECT `film_id` FROM films_genres AS FilmsGenre
WHERE genre_id In (4)
GROUP BY anime_id,film_id
HAVING COUNT(film_id) = 1