Question

You’re help would be much appreciated…
If I have the following table and sample data… myGroupTable

group_Id : user_Id

1 : 3

1 : 7

1 : 100

2 : 3

2 : 7

2 : 100

2 : 104

4 : 42

4 : 98

4 : 13

I would like a sql statement that would…
Return a group_Id that has exactly the specified user_Id’s in them.
eg… is there a group_Id that has User_Id’s 3, 7 and 100
answer: group_id 1.
Please note that I dont want it to return a group_Id 2, as that also has a user_Id of 104 in it…
Kind regards J

Answer 1

Here’s another alternative:

SELECT group_id, GROUP_CONCAT(user_id ORDER BY user_id) AS user_id_list
FROM group_user
GROUP BY group_id
HAVING user_id_list = '3,7,100'