[프로그래머스] 입양 시각 구하기(MySQL)

문제 링크 - https://school.programmers.co.kr/learn/courses/30/lessons/59412

풀이

SELECT HOUR(DATETIME) AS 'HOUR', COUNT(*) AS 'COUNT'
FROM ANIMAL_OUTS
WHERE HOUR(DATETIME) >= 9 AND HOUR(DATETIME) <= 19
GROUP BY HOUR(DATETIME)
ORDER BY HOUR(DATETIME)