问题清单比较

Question

我的个人资料看起来像这样:

profile_id | answer_id
----------------------
1                1
1                4
1               10

我有一个表格,其中包含一些受访者的回复列表,其结构如下:

user_id | answer_id
-------------------
1            1
1            9
2            1
2            4
2           10
3           14
3           29

如何选择在配置文件中提供所有答案的用户列表？在这种情况下只有用户2.

Answer 1

您可以使用以下内容:

select user_id
from response r
where answer_id in (select distinct answer_id  -- get the list of distinct answer_id
                    from profile
                    where profile_id = 1)  -- add filter if needed
group by user_id  -- group by each user
having count(distinct answer_id) = (select count(distinct answer_id)  -- verify the user has the distinct count
                                    from profile
                                    where profile_id = 1)  -- add filter if needed

请参阅SQL Fiddle with Demo

或者另一种写这个的方法是:

select user_id
from response r
where answer_id in (1, 4, 10)
group by user_id
having count(distinct answer_id) = 3

请参阅SQL Fiddle with Demo