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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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MySQL / PostgreSQL
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;