[Programmers] 입양 시각 구하기(1) - 59412

느낀점 : DATE_FORMAT을 잘 활용하자 ~

 

Question

 

보호소에서는 몇 시에 입양이 가장 활발하게 일어나는지 알아보려 합니다. 09:00부터 19:59까지, 각 시간대별로 입양이 몇 건이나 발생했는지 조회하는 SQL문을 작성해주세요. 이때 결과는 시간대 순으로 정렬해야 합니다.

 

 

Point

 

1. SUBSTRING
2. DATE_FORMAT

 

Code (After 25.06.)

 

SELECT HOUR(DATETIME) AS HOUR
        , COUNT(1) AS COUNT
FROM ANIMAL_OUTS
WHERE HOUR(DATETIME) BETWEEN 9 AND 19
GROUP BY 1
ORDER BY 1

 

Code 1 - SUBSTRING 사용

 

SELECT SUBSTRING(DATETIME, 12, 2) AS HOUR
        , COUNT(*) AS 'COUNT'
    FROM ANIMAL_OUTS
    GROUP
       BY HOUR
    HAVING HOUR BETWEEN 9 AND 19
    ORDER BY HOUR

 

 

Code 2 - DATE_FORMAT 사용

 

SELECT DATE_FORMAT(DATETIME,'%H') AS HOUR,
        COUNT(*) AS 'COUNT'
    FROM ANIMAL_OUTS
    GROUP
       BY HOUR
    HAVING HOUR BETWEEN 9 AND 19
    ORDER BY HOUR

 

 

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