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CREATE TABLE test ( person_id smallint, position_id smallint ); INSERT INTO test VALUES (1, 30), (1, 99), (1, 98), (2, 98), (2, 99), (3, 30), (3, 28);
SELECT person_id, Group_concat(position_id SEPARATOR ', ') AS positions from test t WHERE EXISTS ( SELECT person_id FROM test t1 WHERE t.person_id=t1.person_id AND t1.position_id=30 ) AND NOT EXISTS ( SELECT person_id FROM test t2 WHERE t.person_id=t2.person_id AND t2.position_id=28 ) GROUP BY person_id ;
person_id
positions
1
30, 99, 98