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The problem context revolves around classifying triangles into different types based on the lengths of their sides. The types of triangles include equilateral, isosceles, scalene, or not a triangle at all. The lengths of the sides of the triangles are stored in a table named TRIANGLES with columns A, B, and C representing the lengths of the sides.
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The solution approach uses a SQL SELECT statement with a CASE expression. The CASE expression checks the conditions for each type of triangle. If the sum of the lengths of any two sides is less than or equal to the length of the third side, it's not a triangle. If all sides are equal, it's an equilateral triangle. If any two sides are equal, it's an isosceles triangle. If none of these conditions are met, it's a scalene triangle. The result of the CASE expression is returned as a new column named 'triangle_sides'.
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 as triangle_sides
from TRIANGLES
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