ROOT 아이템 구하기.sql

-- 코드를 작성해주세요
SELECT
    ITEM_INFO.ITEM_ID,
    ITEM_NAME
FROM
    ITEM_INFO
INNER JOIN
    ITEM_TREE
ON
    ITEM_INFO.ITEM_ID = ITEM_TREE.ITEM_ID
WHERE
    ITEM_TREE.PARENT_ITEM_ID IS NULL