[프로그래머스] 있었는데요 없었습니다 (Oracle)

문제

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

프로그래머스

 

SELECT I.ANIMAL_ID, O.NAME
FROM ANIMAL_INS I, ANIMAL_OUTS O
WHERE I.ANIMAL_ID = O.ANIMAL_ID
AND I.DATETIME > O.DATETIME
ORDER BY I.DATETIME