Easy: Question 4

/*Determining triangle or not*/
SELECT 
    CASE
        WHEN  (B + C) <= A OR (A + C) <= B OR (A + B)<=C THEN 'Not A Triangle'
        WHEN A = B AND A = C THEN 'Equilateral'
        WHEN A = B OR B = C OR A = C THEN 'Isosceles'
        ELSE 'Scalene'
    END
FROM TRIANGLES;