如何使用count（）运行select查询？

Question

account_users
-----
id | primary_key

posts
-----
post_id | primary_key
author | foreign key to account_users.id

我们说我有2张桌子。 account_users有用户。帖子保留帖子。

如何选择帖子数量（*）超过5的所有用户？

Answer 1

试试这个

SELECT au.*,p.*
FROM account_users au
INNER JOIN posts p
ON p.account_users.id = au.id
GROUP BY p.post_id
HAVING count(*) > 5

Answer 2

@Timex

尝试以下查询。

Select au.ID from account_users au
inner join posts p on au.ID = p.author
Group By au.ID
having COUNT(p.post_id) > 5