Commit 0e32c58

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고다혜: [SQL] 멸종위기의 대장균 찾기_250226

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	`1`	`+WITH recursive CTE AS (`
	`2`	`+ SELECT id, parent_id, 1 as GENERATION`
	`3`	`+ FROM ECOLI_DATA`
	`4`	`+ WHERE PARENT_ID IS NULL`
	`5`	`+`
	`6`	`+ UNION ALL`
	`7`	`+`
	`8`	`+ SELECT b.id, b.parent_id, a.generation + 1`
	`9`	`+ FROM CTE a`
	`10`	`+ JOIN ECOLI_DATA b ON a.id = b.parent_id`
	`11`	`+)`
	`12`	`+`
	`13`	`+SELECT COUNT(a.ID) as COUNT, a.GENERATION`
	`14`	`+FROM CTE a`
	`15`	`+WHERE ID NOT IN (`
	`16`	`+ SELECT DISTINCT PARENT_ID`
	`17`	`+ FROM CTE`
	`18`	`+ WHERE PARENT_ID IS NOT NULL`
	`19`	`+ )`
	`20`	`+GROUP BY a.GENERATION`
	`21`	`+ORDER BY a.GENERATION`

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