g0601_0700.s0608_tree_node.script.sql Maven / Gradle / Ivy

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Kotlin-based LeetCode algorithm problem solutions, regularly updated

There is a newer version: 1.30

# Write your MySQL query statement below
# #Medium #LeetCode_Curated_SQL_70 #Database #SQL_I_Day_4_Union_and_Select
# #2023_02_05_Time_794_ms_(48.38%)_Space_0B_(100.00%)
SELECT
    id,
    CASE
        WHEN p_id IS NULL THEN 'Root'
        WHEN p_id IN (SELECT id FROM Tree) AND id IN (SELECT p_id FROM Tree) THEN 'Inner'
        ELSE 'Leaf'
    END AS type
FROM Tree