MySql得到10条最近的评论以及所有子评论

Question

I have a comment table like

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

Comments can have 1 level sub comments(no 2nd/3rd level nesting). Users can sort comments based on time/likes.

What will be the query to get 10 recent comments along with all their sub comments .

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

This doesn't work.

Answer 1

Add other conditions as needed.

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