Leetcode - 608. Tree Node

Indo Yoon - 14 6월 2022

문제

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.

정답

SELECT id, 
CASE
    WHEN ISNULL(p_id) THEN 'Root'
    WHEN id IN (SELECT p_id FROM Tree) THEN 'Inner'
    ELSE 'Leaf'
END as type
FROM Tree