Type of Triangle.sql

/*
Enter your query here.
Please append a semicolon ";" at the end of the query and enter your query in a single line to avoid error.
Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Output one of the following statements for each record in the table:

Equilateral: It's a triangle with 3 sides of equal length.
Isosceles: It's a triangle with 2 sides of equal length.
Scalene: It's a triangle with 3 sides of differing lengths.
Not A Triangle: The given values of A, B, and C don't form a triangle.
*/

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