[프로그래머스] 입양 시각 구하기(1) (Oracle)

문제

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

프로그래머스

 

SELECT TO_NUMBER(TO_CHAR(DATETIME, 'HH24')) AS HOUR, COUNT(1) AS COUNT
FROM ANIMAL_OUTS
WHERE TO_CHAR(DATETIME, 'HH24') BETWEEN 9 AND 19
GROUP BY TO_CHAR(DATETIME, 'HH24')
ORDER BY HOUR
;