https://www.hackerrank.com/challenges/what-type-of-triangle/problem
SELECT
CASE
WHEN A=B AND B=C THEN 'Equilateral'
WHEN A+B<=C OR A+C<=B OR B+C<=A THEN 'Not A Triangle'
WHEN A=B OR A=C OR B=C THEN 'Isosceles'
ELSE 'Scalene'
END
FROM TRIANGLES
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