如何在mysql中使用嵌套大小写查找三角形的类型(给出了三条边的长度)？

bkkx9g8r 于 2021-07-24 发布在 Java

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这个问题在这里已经有答案了：

mysql中的三角形类型（19个答案）
10个月前关门了。

在这个mysql查询中wrobg是什么？它显示语法错误。

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

sql mysql case-when

来源：https://stackoverflow.com/questions/62744685/how-to-find-type-of-trianglelength-of-three-sides-are-given-using-nested-case

2条答案

按热度按时间

yzuktlbb1#

为此，您还必须添加一个

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

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mctunoxg2#

没有必要筑巢 case 表达：

SELECT (CASE WHEN A = B AND A = C THEN 'Equilateral'
             WHEN A = B AND C < A + B THEN 'Isosceles'
             WHEN A = B THEN 'Not A Triangle'
             WHEN B = C AND A < B + C THEN 'Isosceles'
             WHEN B = C THEN 'Not A Triangle'
             WHEN A + B > C AND A + C > B AND B + C > A THEN 'Scalene'
             ELSE 'Not A Triangle'
        END) as type
FROM TRIANGLES;

赞(0）回复(0）举报 2021-07-24

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如何在mysql中使用嵌套大小写查找三角形的类型(给出了三条边的长度)？

2条答案

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