[HackerRank] Type of Triangle

# Type of Triangle
select case when((A >= B+C) or (B >= A+C) or (C >= A+B)) then 'Not A Triangle'
            when(A = B and A = C) then 'Equilateral'
            when(A != B and A != C and B!=C) then 'Scalene'
            else 'Isosceles'
        end
from TRIANGLES;