[Programmers][SQL] 있었는데요 없었습니다 (59043번) - MySQL Solution

문제

• https://programmers.co.kr/learn/courses/30/lessons/59043

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Solution

SELECT INS.ANIMAL_ID, INS.NAME
FROM ANIMAL_INS AS INS LEFT JOIN ANIMAL_OUTS AS OUTS ON INS.ANIMAL_ID = OUTS.ANIMAL_ID
WHERE INS.DATETIME > OUTS.DATETIME
ORDER BY INS.DATETIME