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**SELECT N,
CASE WHEN P IS NULL THEN 'Root'
WHEN N NOT IN (SELECT P FROM BST WHERE P IS NOT NULL) THEN 'Leaf'
ELSE 'Inner'
END
FROM BST
ORDER BY N ; **
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Binary Tree Nodes
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**SELECT N, CASE WHEN P IS NULL THEN 'Root' WHEN N NOT IN (SELECT P FROM BST WHERE P IS NOT NULL) THEN 'Leaf' ELSE 'Inner' END FROM BST ORDER BY N ; **