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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 and C=A then "Equilateral"
when
A=B or B=C or C=A then "Isosceles"
when
A!=B and B!=C and C!=A then "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 and C=A then "Equilateral" when A=B or B=C or C=A then "Isosceles" when A!=B and B!=C and C!=A then "Scalene" end from triangles;