[MySQL] 프로그래머스 - 입양 시각 구하기(1)(GROUP BY)

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

프로그래머스

 

SELECT HOUR(DATETIME) AS HOUR, COUNT(DATETIME) AS COUNT
FROM ANIMAL_OUTS
GROUP BY HOUR(DATETIME)
HAVING HOUR >= 9 AND HOUR<=19
ORDER BY HOUR;

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