Hackerrank - Type Of Triangle solution

Problem link

Solution one:

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"
          ELSE "Scalene"
        END
      ELSE "Not A Triangle"
  END
FROM TRIANGLES;