[프로그래머스_mysql] 없어진 기록 찾기

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https://school.programmers.co.kr/learn/courses/30/lessons/59042

 

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문제

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풀이

SELECT B.ANIMAL_ID, B.NAME
FROM ANIMAL_INS A RIGHT JOIN ANIMAL_OUTS B
ON A.ANIMAL_ID = B.ANIMAL_ID
WHERE A.DATETIME IS NULL
ORDER BY B.ANIMAL_ID ASC