SQL 문제 16 - Tree Node LeetCode 608 Tree Node 풀이 SELECT ID , CASE WHEN P_ID IS NULL THEN 'Root' WHEN ID NOT IN (SELECT P_ID FROM TREE WHERE P_ID IS NOT NULL) THEN 'Leaf' ELSE 'Inner' END AS TYPE FROM TREE; * 출처 Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. leetcode.com...
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