문제 정답 SELECT B.ANIMAL_ID, B.NAME FROM ANIMAL_INS A RIGHT JOIN ANIMAL_OUTS B ON A.ANIMAL_ID = B.ANIMAL_ID WHERE A.ANIMAL_ID IS NULL ORDER BY 1 결과
SELECT B.ANIMAL_ID, B.NAME FROM ANIMAL_INS A RIGHT JOIN ANIMAL_OUTS B ON A.ANIMAL_ID = B.ANIMAL_ID WHERE A.ANIMAL_ID IS NULL ORDER BY 1