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SELECT N, CASE
WHEN P is null THEN 'Root' WHEN N IN (SELECT P FROM BST) THEN 'Inner' ELSE 'Leaf'
END AS node_type
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 IN (SELECT P FROM BST) THEN 'Inner' ELSE 'Leaf'
END AS node_type
FROM BST order by N;