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select
b.N,
case
when b.p is null then 'Root'
when b.N in (select k.p from bst k where k.p is not null) then 'Inner'
else 'Leaf'
end
from bst b
order by 1;
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Binary Tree Nodes
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it works in oracle
select b.N, case when b.p is null then 'Root' when b.N in (select k.p from bst k where k.p is not null) then 'Inner' else 'Leaf' end from bst b order by 1;