mysql - 如何计算总评论数？

Question

我有以下表格：

   fss_post(post_id,text)
   fss_comment(idComment, post_id, text)

是否可以编写一个查询，为每个 post_id 提供一行以及该帖子的总评论数？

例子：

    post_id       comment_count
    101010        5
    101011        0

等等...谢谢。

Answer 1

select 
p.post_id,count(*) 'comment_count'
from
fss_post p
left join fss_comment c on p.post_id = c.post_id
group by p.post_id

Answer 2

试试这个：选择 post_id, COUNT(comment_id) from comments GROUP BY post_id;