Question

(I don’t think I have titled this question correctly – but I don’t know how to describe it)

Here is what I am trying to do:

Let’s say I have a Person table that has a PersonID field. And let’s say that a Person can belong to many Groups. So there is a Group table with a GroupID field and a GroupMembership table that is a many-to-many join between the two tables and the GroupMembership table has a PersonID field and a GroupID field. So far, it is a simple many to many join.

Given a list of GroupIDs I would like to be able to write a query that returns all of the people that are in ALL of those groups (not any one of those groups). And the query should be able to handle any number of GroupIDs. I would like to avoid dynamic SQL.

Is there some simple way of doing this that I am missing?
Thanks,
Corey

Answer 1

select person_id, count(*) from groupmembership
where group_id in ([your list of group ids])
group by person_id
having count(*) = [size of your list of group ids]

Edited: thank you dotjoe!