Type of Triangle in MYSQL

Question

Problem statement:

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

Answer 1

Give it a try. That should definitely work.

SELECT
  CASE
    WHEN A + B <= C OR A + C <= B OR B + C <= A THEN 'Not A Triangle'
    WHEN A = B AND B = C THEN 'Equilateral'
    WHEN A = B OR A = C OR B = C THEN 'Isosceles'
    ELSE 'Scalene'
  END
FROM TRIANGLES;

Answer 2

For MySQL:

select
  case
      when (a+b>c) and (a+c>b) and (b+c>a) then
           case
              when (a=b) and (b=c) and (a=c) then 'Equilateral'
              when (a=b) or (b=c) or (a=c) then 'Isosceles'
              else 'Scalene'
           end
       else 'Not A Triangle'
    end    
from TRIANGLES 

Answer 3

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 (C=A) OR (B=C) THEN "Isosceles" 
ELSE "Scalene" 
END 
FROM TRIANGLES

Answer 4

MySQL:

select
case 
    when ((A+B)<=C) || ((C+B)<=A) || ((A+C)<=B)  then 'Not A Triangle'
    when A=B && B=C && A=C then 'Equilateral'
    when ((A=B) && (A+B)>C) || ((B=C) && (B+C)>A)  then 'Isosceles'    
    when A!=B && B!=C && A!=C then 'Scalene' 
    end
from TRIANGLES;

Explanation:

First, check whether the values satisfies the requirement of a triangle(i.e sum of two sides must be greater than the other side) - Not A Triangle

Then, look for the type of the triangle

1. Equilateral - All sides are equal
2. Isosceles - Any two sides are equal(included additional condition of sum two sides greater than the other side - this can be ignored as we check the fundamental rule of a triangle as a first case)
3. Scalene - All three sides are different

Answer 5

select case when a=b and b=c then 'Equilateral' when a+b <=c or b+c<=a or a+c

Answer 6

/* THE BELOW CODE WILL CHECK ALL THE POSSIBLE CASES OF A TRIANGLE, THIS CODE WILL WORK 100% */

select case
when A+B<=C OR A+C<=B OR C+B<=A THEN "Not A Triangle"
when (A<>B AND A+B>C) AND (B<>C AND B+C>A) AND (A<>C AND A+C>B) THEN 
"Scalene"
when (A=B AND B<>C AND A+B>C) OR (B=C AND B<>A AND B+C>A) OR (A=C AND C<>B 
AND A+C>B) THEN "Isosceles"
when A=B AND B=C THEN "Equilateral"
end as triangle
from TRIANGLES;