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