Lv.3_오랜 기간 보호한 동물(2)

https://school.programmers.co.kr/learn/courses/30/lessons/59411

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SELECT ANIMAL_ID, NAME
FROM (SELECT O.ANIMAL_ID, O.NAME, (O.DATETIME - I.DATETIME) TIME
      FROM ANIMAL_INS I INNER JOIN ANIMAL_OUTS O
      ON I.ANIMAL_ID = O.ANIMAL_ID
      ORDER BY TIME DESC)
WHERE ROWNUM <= 2;