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select N,
case
when P IS NULL then 'Root'
when N IN (select distinct P from BST where P is not null) 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 distinct P from BST where P is not null) then 'Inner'
else 'Leaf' end as node_type from BST order by N;