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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 BinaryTree
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 WHERE P is Not null) Then 'Inner' Else 'Leaf' END) as BinaryTree FROM BST Order by N;