Hackerrank In Top 30 MAANG question-SQL — Type of Triangle

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

Solution Mysql:

select 
    (case 
        when not (a + b > c and b + c > a and c + a > b) then "Not A Triangle"
        when a = b and b = c then "Equilateral"
        when a = b or b = c or c = a then "Isosceles"
else "Scalene" end) from Triangles;