해커랭크 HackerRank Type of Triangle Advanced Select

Type of Triangle - CASE END를 활용해야 합니다.

Write a query identifying the type of each record in the TRIANGLES table using its three side lengths.

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