Solution.sql

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