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SELECT N, CASE WHEN P IS NULL THEN 'Root' WHEN N IN (SELECT DISTINCT P FROM bst) THEN 'Inner' ELSE 'Leaf' END AS NodeType 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 DISTINCT P FROM bst) THEN 'Inner' ELSE 'Leaf' END AS NodeType FROM bst ORDER BY N;