Problemet kaldes Relational Division .
SELECT group_id
FROM stuff
WHERE member_id IN (11,22,33)
GROUP BY group_id
HAVING COUNT(*) = 3
hvis member_id er ikke unik for hver group_id , skal du have DISTINCT for kun at tælle unikke værdier.
SELECT group_id
FROM stuff
WHERE member_id IN (11,22,33)
GROUP BY group_id
HAVING COUNT(DISTINCT member_id) = 3
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