Question

I’m struggling to get the following MySQL statement to work.

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

I’m trying to find the uploads related to comments but it is throwing SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name ‘id’.

I’m sure it’s something small but I just can’t find what i’m doing wrong and I’d really appreciate some help.

Thank you for your time!

Alex

Answer 1

You cant name two tables with same alias FROM comments As Comment and GROUP BY Comment.uploads_id) Comment, use Comment_A and Comment_B for example.