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이예진: [SQL] Tree Node_241217

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SQL/15주차
- Tree Node.sql

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`‎SQL/15주차/Tree Node.sql‎`

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	`1`	`+SELECT`
	`2`	`+ t1.id,`
	`3`	`+ CASE`
	`4`	`+ WHEN t1.p_id IS NULL THEN 'Root'`
	`5`	`+ WHEN t2.id IS NULL THEN 'Leaf'`
	`6`	`+ ELSE 'Inner'`
	`7`	`+ END AS type`
	`8`	`+FROM Tree t1`
	`9`	`+LEFT JOIN Tree t2`
	`10`	`+ON t1.id = t2.p_id`
	`11`	`+GROUP BY t1.id;`

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