문제 link
https://www.hackerrank.com/challenges/what-type-of-triangle/problem
Code link
https://github.com/JamesJung01/Hackerrank_sql/blob/main/01_Easy/Type_of_Triangle.sql
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;