SELECT DISTINCT(t1.person_id) AS person_id FROM tblgroupperson AS t1 LEFT JOIN tblgroupperson AS t2 ON t2.person_id = t1.person_id WHERE (t1.group_id = '1' OR t1.group_id = '200') AND (t2.group_id = '1' OR t2.group_id = '200')
SELECT DISTINCT(t1.person_id) AS person_id FROM tblgroupperson AS t1 LEFT JOIN tblgroupperson AS t2 ON t2.person_id = t1.person_id WHERE (t1.group_id = '1' AND t2.group_id = '200') OR (t2.group_id = '1' AND t1.group_id = '200')
SELECT person_id FROM tblgroupperson WHERE group_id=1 OR group_id=200 GROUP BY person_id HAVING count(person_id)>1
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