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select
case
WHEN A+B<=C OR B+C<=A OR A+C<=B then "Not A Triangle"
when a = b and b = c then 'Equilateral'
when a = b or b=c or a = c then 'Isosceles'
else 'Scalene'
end
from Triangles;
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Type of Triangle
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select case WHEN A+B<=C OR B+C<=A OR A+C<=B then "Not A Triangle" when a = b and b = c then 'Equilateral' when a = b or b=c or a = c then 'Isosceles' else 'Scalene' end from Triangles;