Type of Triangle:- HackerRank SQL Solution in MYSQL

Problem:-

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

Input Format

The TRIANGLES table is described as follows:

Each row in the table denotes the lengths of each of a triangle's three sides.

Sample Input

Sample Output

Isosceles
Equilateral
Scalene
Not A Triangle

Explanation

Values in the tuple  form an Isosceles triangle, because . 
Values in the tuple  form an Equilateral triangle, because . Values in the tuple  form a Scalene triangle, because . 
Values in the tuple  cannot form a triangle because the combined value of sides  and  is not larger than that of side .

Solution:-

SELECT

    IF(

        A+B <= C,

        'Not A Triangle',

        IF(

            A = B AND A = C,

            'Equilateral',

            IF(

                A = B OR A = C OR B = C,

                'Isosceles',

                'Scalene'

            )

        )

    )

FROM TRIANGLES