mysql - 如何按类别排除记录

Question

我有声明:

$statement_q = "
SELECT img 
     , title
     , time
     , videos.id 
     , date 
  FROM videos 
  JOIN videocategories 
    ON videos.id = videocategories.video_id 
  JOIN categories 
    ON categories.id = videocategories.category_id 
 WHERE categories.name != 'Western'
 GROUP 
    BY videos.id 
 ORDER 
    BY videos.id 
 LIMIT {$startpoint} , {$per_page}";

层次结构:

如果电影有多个类别，它会显示它!

Movie 1 : Werstern, Adventure (它会放映)

电影 2:西部片(一类所以不会显示)

如何排除西方电影？

Answer 1

像这样的东西应该可以工作。我现在无法创建表来验证它。

$statement_q = "SELECT img,title,time,videos.id as id,date FROM videos 
INNER JOIN videocategories ON videos.id = videocategories.video_id 
INNER JOIN categories on categories.id = videocategories.category_id 
WHERE categories.name != 'Western'
AND not exists (select v.id from videocategories v where v.video_id = videos.id
                and v.category_id <> videocategories.category_id)
GROUP by videos.id 
ORDER BY videos.id 
LIMIT {$startpoint} , {$per_page}";