ํฐ์คํ ๋ฆฌ ๋ทฐ
๋ฌธ์ :
์ฝ๋:
SELECT HOUR(DATETIME) AS HOUR, COUNT(*) AS COUNT
FROM ANIMAL_OUTS
WHERE HOUR(DATETIME) BETWEEN 9 AND 19
GROUP BY HOUR(DATETIME)
ORDER BY HOUR(DATETIME) ASC
ํ์ด:
1. DATETIME์ "2014-06-28 13:40:00" ์ด๋ฐ ํ์์ผ๋ก ๋์ด ์์. -> HOUR ํจ์๋ฅผ ์ฌ์ฉํ๋ฉด ๋จ.
2. WHERE ๋ก ๋ฒ์ ์ง์ -> BETWEEN ? AND ? ํ๋ฉด ๋จ. / where๊น์ง๋ as hour์ด ์ ์ฉ ์๋จ!
3. GROUP BY, ORDER BY ๋ as hour ์ ์ฉ๋จ.
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