我有三张桌子.
@H_502_5@posts
| id | title |
+---------+-----------+
| 1 | hello |
| 2 | goodbye |
+---------+-----------+
posts_tags
| tag_id | post_id |
+---------+-----------+
| 1 | 1 |
| 2 | 1 |
| 2 | 2 |
+---------+-----------+
tags
| id | name |
+---------+-----------+
| 1 | news |
| 2 | photos |
+---------+-----------+
我希望能够选择帖子,但结果就是这样
@H_502_5@post.id post.title tags
------------------------------------
1 hello news,photos
2 goodbye photos
就像是
@H_502_5@SELECT *,GROUP_CONCAT(tags.name) AS tags
FROM posts
LEFT JOIN posts_tags
ON posts.id = posts_tags.post_id
LEFT JOIN tags
ON posts_tags.tag_id = tags.id
似乎没有正常工作.请指教,谢谢你的时间:)
最佳答案