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You could also not write the last condition before 'Not A Triangle' to simplify the Query:
SELECT CASE WHEN
A + B > C AND A + C > B AND B + C > A THEN CASE
WHEN A = B AND B = C THEN 'Equilateral'
WHEN A = B OR B = C OR A = C THEN 'Isosceles'
ELSE 'Scalene' END
ELSE 'Not A Triangle' END FROM TRIANGLES;
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Type of Triangle
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You could also not write the last condition before 'Not A Triangle' to simplify the Query:
SELECT CASE WHEN A + B > C AND A + C > B AND B + C > A THEN CASE WHEN A = B AND B = C THEN 'Equilateral' WHEN A = B OR B = C OR A = C THEN 'Isosceles' ELSE 'Scalene' END ELSE 'Not A Triangle' END FROM TRIANGLES;