mysql - 我如何在 MySQL 中处理这样的查询，也许是 Group_Concat？

Question

好的，我在 MySQL 中有上述数据库布局，我正在尝试进行一个查询来获取有关电影的所有信息并对其进行良好的格式化。

假设我的表格中有以下信息

movie
id        name
1         "Batman"
2         "Superman"

genre
id        name
1         "Thriller"
2         "Horror"

language  
id        lang
1         "English"
2         "Spanish"

theatre
id        name
1         "First Theatre"
2         "Second Theatre"

movie_genre
movie_id  genre_id
1         1
1         2
2         2

movie_release
id        language_id     movie_id
1         1               1
2         2               1
3         1               2

theatre_release
movie_release_id     theatre_id
1                    1
2                    2
3                    1
3                    2

理想情况下，输出是这样的

movie.name   genres             releases
"Batman"     "thriller, horror" English, Theatre One
                                Spanish, Theatre Two

"Spiderman"  "Horror"           Spanish, Theatre One, Theatre Two

我的查询尝试

Select
     movie.name
     Group_Concat(genre.name) as genres
     Group_concat(language.lang, group_concat(theatre.name)) as releases
from
    movie
    left join movie genre on movie.id = movie_genre.movie_id
    left join genre on genre.id = movie_genre.genre_id
    left join movie_release on movie_release.movie_id = movie.id
    left join language on movie_release.language_id = language.id
    left join theatre_release on theatre_release.movie_release_id = movie_release.id
    left join theatre on theatre_release.theatre_id = theatre.id

Answer 1

您不需要嵌套的GROUP_CONCAT。

使用CONCAT组合lang和name然后添加GROUP_CONCAT得到结果

Select
     movie.name
     Group_Concat(genre.name) as genres
     GROUP_CONCAT(CONCAT(language.lang,' , ',theatre.name) SEPARATOR ' | ') as releases
from ...