MySQL子查询错误：SQLSTATE [42S21]：列已经存在：1060重复的列名'id'

Question

我努力让下面的MySQL语句正常工作。

SELECT ItemGroup.users_id,ItemGroup.comments_id,ItemGroup.uploads_id,ItemGroup.posts_id, 
       Comment.id,Comment.uploads_id, 
       CommentUpload.id, 
       Upload.id, 
       Post.id 
       FROM items AS ItemGroup 
       LEFT JOIN (
        SELECT Comment.id, Comment.uploads_id, CommentUpload.id, CommentUpload.uuid 
        FROM comments As Comment 
        INNER JOIN (
         SELECT CommentUpload.id, CommentUpload.uuid 
         FROM uploads AS CommentUpload 
         ) CommentUpload ON CommentUpload.id = Comment.uploads_id 
        GROUP BY Comment.uploads_id 
       ) Comment ON Comment.id = ItemGroup.comments_id 
       LEFT JOIN (
        SELECT Upload.id 
        FROM uploads AS Upload 
        ) Upload ON Upload.id = ItemGroup.uploads_id 
       LEFT JOIN (
        SELECT Post.id 
        FROM posts AS Post 
        ) Post ON Post.id = ItemGroup.posts_id 
       WHERE ItemGroup.users_id = {$__cakeID__$} 
       AND (
       Comment.id IS NOT NULL 
       OR Upload.id IS NOT NULL 
       OR Post.id IS NOT NULL 
       ) 
       LIMIT 0 , 300 

我试图找到相关评论上传，但它是扔SQLSTATE [42S21]：列已经存在：1060重复列名“身份证”。

我敢肯定，这是一个小事，但我无法找到我做错了什么，我非常感谢一些帮助。

谢谢你的时间！

亚历

Answer 1

你不能用名称相同的别名FROM comments As Comment和GROUP BY Comment.uploads_id) Comment，两个表例如使用Comment_A和Comment_B。