Question

I have a profile that looks like this:

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

I have a table which contains a list of responses by poll respondents with structure like this:

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

How do I select a list of users that gave all of the answers in the profile? In this case only user 2.

Answer 1

You can use the following:

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

See SQL Fiddle with Demo

Or another way to write this is:

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

See SQL Fiddle with Demo