sql select with count condition

Question

我的数据库中有2个表，第一个表称为“问题”，表示持有id的问题，第二个表称为“答案”并保留问题的答案（作为多个选项）。

如何选择少于4个答案的问题？

问题表：

id     question
1      what is ...?
2      how many ...?
3      Is ....?

答案表

id     question_id     answer
1          1             54
2          1             11
3          1             22
4          2            England
5          1              5
6          2            Turkey

如何选择答案少于4的问题？

感谢，

Answer 1

select questions.id, questions.question from questions 
inner join answers on questions.id = answers.question_id
group by questions.id, questions.question having count(questions.id) <4

你走了。

Answer 2

使用它：

SELECT * 
FROM questions 
WHERE id in
    (
    SELECT question_id 
    from answers 
    group by question_id 
    having count(question_id) <4
    )