MySQL的：简单的查询修改

Question

有这三个表：

1. 帖子
2. posts_replies
3. 喜欢

该查询返回我的帖子及其回复数无一不精。

SELECT posts.title, posts.num, posts.status, posts.category, posts.content, posts.member_num, COUNT(posts_replies.blyrb_num) AS count, COUNT(likes.comment_num) AS likes_count 
FROM posts_replies 
INNER JOIN posts ON (posts_replies.blyrb_num = posts.num) 
LEFT JOIN likes ON (likes.comment_num = posts_replies.num) 
WHERE posts.status <>3 
AND posts.access = 'Public' 
AND (
posts.title LIKE '%dress%' 
OR posts.content LIKE '%dress%' 
) 
GROUP BY posts.num 

但问题是这个查询只返回有一些答复的帖子。我不想要这样的限制，我想要所有帖子，不管他们是否有答复。

任何想法，我在做什么错在这里？

谢谢

Answer 1

交换表中 'FROM' 和你的第一个 '加入'，并改变你的第一个 '加入' 到LEFT JOIN，应该做的伎俩：

SELECT posts.title, posts.num, posts.status, posts.category, posts.content, posts.member_num, COUNT(posts_replies.blyrb_num) AS count, COUNT(likes.comment_num) AS likes_count 
FROM posts 
LEFT JOIN posts_replies ON (posts_replies.blyrb_num = posts.num) 
LEFT JOIN likes ON (likes.comment_num = posts_replies.num) 
WHERE posts.status <>3 
AND posts.access = 'Public' 
AND (
posts.title LIKE '%dress%' 
OR posts.content LIKE '%dress%' 
) 
GROUP BY posts.num 

Answer 2

旅游这样做：

• 使用LEFT JOIN代替INNER JOIN
• 交换表：POST和posts_replies

查询，

SELECT posts.title, 
     posts.num, 
     posts.status, 
     posts.category, 
     posts.content, 
     posts.member_num, 
     COUNT(posts_replies.blyrb_num) AS count, 
     COUNT(likes.comment_num) AS likes_count 
FROM posts 
     LEFT JOIN posts_replies 
      ON (posts_replies.blyrb_num = posts.num) 
     LEFT JOIN likes 
      ON (likes.comment_num = posts_replies.num) 
WHERE posts.status <> 3 AND 
     posts.access = 'Public' 
     AND 
     (
      posts.title LIKE '%dress%' 
      OR posts.content LIKE '%dress%' 
     ) 
GROUP BY posts.num