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SELECT N,
CASE WHEN P IS NULL THEN 'Root'
WHEN N IN (SELECT P FROM BST WHERE P IS NOT NULL) THEN 'Inner'
ELSE 'Leaf'
END AS BINARY_TREE
FROM BST
ORDER BY N
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Binary Tree Nodes
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SQL SERVER : Its gonna work, believe me.
SELECT N, CASE WHEN P IS NULL THEN 'Root' WHEN N IN (SELECT P FROM BST WHERE P IS NOT NULL) THEN 'Inner' ELSE 'Leaf' END AS BINARY_TREE FROM BST ORDER BY N