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배수빈: [SQL] 입양 시각 구하기(2)_250307

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	`1`	`+WITH RECURSIVE TM AS (`
	`2`	`+ SELECT 0 AS HOUR`
	`3`	`+ UNION ALL`
	`4`	`+ SELECT HOUR+1`
	`5`	`+ FROM TM`
	`6`	`+ WHERE HOUR < 23`
	`7`	`+)`
	`8`	`+`
	`9`	`+SELECT A.HOUR, IFNULL(B.COUNT, 0) AS COUNT`
	`10`	`+FROM TM A`
	`11`	`+LEFT JOIN (`
	`12`	`+ SELECT HOUR(DATETIME) AS HOUR,`
	`13`	`+ COUNT(HOUR(DATETIME)) AS COUNT`
	`14`	`+ FROM ANIMAL_OUTS`
	`15`	`+ GROUP BY HOUR(DATETIME)`
	`16`	`+) B ON A.HOUR = B.HOUR`

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