[SQL] 프로그래머스 오랜 기간 보호한 동물(1)

https://programmers.co.kr/learn/courses/30/lessons/59044

코딩테스트 연습 - 오랜 기간 보호한 동물(1)

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mySql

 SELECT 
    I.NAME, I.DATETIME
 FROM ANIMAL_INS AS I
 LEFT JOIN ANIMAL_OUTS AS O ON I.ANIMAL_ID = O.ANIMAL_ID
 WHERE I.ANIMAL_ID NOT IN (SELECT O.ANIMAL_ID
                            FROM ANIMAL_OUTS AS O)
 ORDER BY I.DATETIME
 LIMIT 3

 

oracle

SELECT *
    FROM (SELECT I.NAME, I.DATETIME
            FROM ANIMAL_INS I
            LEFT JOIN ANIMAL_OUTS O ON I.ANIMAL_ID = O.ANIMAL_ID
            WHERE O.ANIMAL_ID IS NULL
            ORDER BY I.DATETIME)
    WHERE ROWNUM < 4