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A != B OR B != C OR A != C also can be not triangle
(3, 4, 5) is a triangle, but (3, 4, 50) is not.
but this fails in the first condition in the query
CASE WHEN A + B > C AND A+C>B AND B+C>A so the query is correct
when A+B > C AND A=B AND B=C AND A=C
when A+B > C AND A=B OR B=C OR A=C
when A+B > C AND A!=B
'Not A Triangle'
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
if "Case1: A + B > C AND A+C>B AND B+C>A" is true then only after that you have to verify "case2: A != B OR B != C OR A != C" which kind of triangle it is. If it is not a valid triangle, case1 will be false and you don't have to worry about the rest cases.
that is the raason he gave when A+B>c;
no, it is the case of a scalene triangle.
but a case where A+B
A!=B AND B!=C I think this would work
check in example it is scalene type