HackerRank-Type of Triangle

MaheswaraReddy
2 min readDec 24, 2022

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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.

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 (20,20,23) form an Isosceles triangle, because A=B.
Values in the tuple (20,20,20) form an Equilateral triangle, because A=B=C. Values in the tuple (20,21,22) form a Scalene triangle, because A!=B!=C.
Values in the tuple (13,14,30) cannot form a triangle because the combined value of sides A and B is not larger than that of side C.

SourceCode

SELECT
CASE
WHEN (A+B <= C OR B+C <= A OR A+C <= 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

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