Easy - Q4

select case 
    when A = B and B = C then 'Equilateral'
    when (A = B or B = C or C = A) and A+B> C and B+C>A and A+C>B then 'Isosceles'
    when (A != B and B != C and C != A) and A+B> C and B+C>A and A+C>B then 'Scalene'
    else 'Not A Triangle'
end from TRIANGLES;