HackerRank MySQL - Type of Triangle

/*
    Enter your query here and follow these instructions:
    1. Please append a semicolon ";" at the end of the query and enter your query in a single line to avoid error.
    2. The AS keyword causes errors, so follow this convention: "Select t.Field From table1 t" instead of "select t.Field From table1 AS t"
    3. Type your code immediately after comment. Don't leave any blank line.
*/

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;