Question

我有一个mysql选择获取帖子，喜欢它，评论。问题是我注意到，如果一个帖子有2个像或更多，它将乘以评论数。

例如：用户有2条评论。

1 like - 2 comment
2 likes - 4 comments (user has 2, but will show 4)
3 likes - 6 comments (user has 2)

可以看出喜欢是以某种方式增加评论。

我的查询有什么问题？

select c.nome, p.foto, c.user, p.user, p.id, p.data, p.titulo, p.youtube, pp.foto, count(DISTINCT likes.user) as likes_count, SUM(CASE comentarios.delete WHEN 0 THEN 1 ELSE 0 END)
as comentarios_count, count(DISTINCT l2.user) as count2 from posts p 
join cadastro c on p.user=c.id 
left join profile_picture pp on p.user = pp.user
left join likes on likes.post = p.id // here?
left join comentarios on comentarios.foto = p.id
left join likes l2 on l2.post = p.id and l2.user = '1'
group by p.id
order by p.id desc limit 10

CREATE TABLE IF NOT EXISTS `likes` (
  `user` int(11) UNSIGNED NOT NULL,
  `post` int(11) UNSIGNED NOT NULL,
  `data` datetime NOT NULL,
  UNIQUE KEY `user_post` (`user`,`post`),
  FOREIGN KEY (`post`) REFERENCES posts (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=1 ;

CREATE TABLE IF NOT EXISTS `comentarios` (
  `id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  `foto` int(11) UNSIGNED NOT NULL,
  `user` int(11) UNSIGNED NOT NULL,
  `texto` varchar(3000) NOT NULL,
  `data` datetime NOT NULL,
  `ip` varchar(20) NOT NULL,
  `delete` tinyint(1) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  FOREIGN KEY (`foto`) REFERENCES posts (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 AUTO_INCREMENT=1 ;

如果需要另一张桌子，请问。

Answer 1

你必须得到喜欢，用不同的查询评论。因为你已经加入了他们，但他们彼此没有相互关联，喜欢和评论属于post，所以你创建了一个查询，让帖子喜欢和评论查询不要在数据库级别混合，你必须管理通过代码，您可以使用每个喜欢的更新查询管理邮政表上的计数器，并根据需要进行评论。希望你明白我的意思......

喜欢是评论数字倍增？

1 个答案: