Question 4

SELECT CASE 
    when A+B > C AND A+C > B AND B+C > A THEN CASE 
        when A = B AND B = C THEN 'Equilateral' 
        when A = B OR B = C OR A = C THEN 'Isosceles' 
        when A != B OR B != C OR A != C THEN 'Scalene' 
        END 
    ELSE 'Not A Triangle' END 
FROM TRIANGLES;