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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 as 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 NOT IN(SELECT P FROM BST WHERE P IS NOT NULL) THEN 'Leaf' else 'Inner' END as type from bst ORDER BY N;