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select
case
when A+B > C AND A=B AND B=C AND A=C
then 'Equilateral'
when A+B > C AND A=B OR B=C OR A=C
then 'Isosceles'
when A+B > C AND A!=B
then 'Scalene'
else
'Not A Triangle'
End
from TRIANGLES

## Type of Triangle

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select case when A+B > C AND A=B AND B=C AND A=C then 'Equilateral' when A+B > C AND A=B OR B=C OR A=C then 'Isosceles' when A+B > C AND A!=B then 'Scalene' else 'Not A Triangle' End from TRIANGLES

TRY THIS.........

IF (A,B,C)= (20,1,1) then foolow your code the result will be "Isosceles'

But in fact this is not a triangle because A< B+C So the point is you forget the condition B+C>A AND A+C>B

But i wonder why the code is accepted in this case

I dont understand your meaning, it says in every sub that A+B>C