php - MySql 获取最近 10 条评论以及所有子评论

Question

我有一个评论表，例如

id | post_id | parent_id | user_id | text | time | likes

评论可以有 1 级子评论(无 2/3 级嵌套)。用户可以根据时间/喜欢对评论进行排序。

获取最近 10 条评论以及所有子评论的查询是什么。

SELECT `id`, `user_id`, `text` 
FROM `comments` 
WHERE `post_id` = '$postId' OR `parent_id` IN 
(
   SELECT `id` FROM `comments` 
   WHERE `post_id` = '$postId' 
   ORDER BY `time` DESC 
   LIMIT 10
) 
ORDER BY `time` DESC 
LIMIT 10

这不起作用。

Answer 1

根据需要添加其他条件。

SELECT c.`id`, c.`parent_id`, c.`user_id`, c.`text` 
FROM `comments` c,
(
   SELECT `id` FROM `comments` 
   WHERE `post_id` = '$postId' 
   ORDER BY `time` DESC 
   LIMIT 10
) temp
where c.id = temp.id or c.parent_id=temp.id