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  1. Practice
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  4. Type of Triangle
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Type of Triangle

  • elliott_j_harri1 + 1 comment

    I had very similar code but I put the 'Iscoceles' case statment before the 'Not a Triangle' one and it caused an error. The order in which you check the statments can really reduce the logic in your code :)

    SELECT CASE WHEN C >= A + B 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 'Triangles' FROM TRIANGLES;

    • antoniro + 1 comment

      Exactly! I have been saying that in few comments!

      You don't need to have multiple CASE statements next to each other or nested CASEs. If you check the conditions in the right order, only one CASE statement with multiple WHENs will do the job:

      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

      I think this is the cleanest and shortest answer...

      • veerankisatya80 + 0 comments

        When the Isosceles and Equilateral case statements order are reversed, that is the Equi is checked after Isos then the test case fails. Is it a necessaity to do this in this ordeR?