Question

问题陈述：

编写一个查询，以识别TRIANGLES中每条记录的类型   桌子使用其三个边长。输出以下之一   表中每条记录的陈述：


不是三角形：A，B和C的给定值不形成三角形。

等边：这是一个边长相等的三角形。

Isosceles：这是一个两边长度相等的三角形。

Scalene：这是一个边长不同的三角形。输入格式


TRIANGLES表描述如下：

表中的每一行表示每个三角形的长度   三方面。

Sample Input 
------------
A  B  C  
20 20 23 
20 20 20  
20 21 22  
13 14 30

Sample Output
-------------
Isosceles
Equilateral
Scalene
Not A Triangle

尝试不起作用：

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"  
  when A<>B and B<>C then "Scalene" 


 end as triangles_type 
from TRIANGLES;

Answer 1

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 triangles_type
from TRIANGLES;

Answer 2

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'
    WHEN A <> B and B <> C THEN 'Scalene'
  END tuple
FROM TRIANGLES;

使用case语句检查给定输入是否为三角形。
如果是三角形，则检查所有边是否相同如果为真三角形类型为＆＃39; Equilateral＆＃39;。
如果不是，如果 true 检查是否有任何双方是相等的，则三角形类型是＆＃39; Isosceles＆＃39;
在不相等的情况下，三角形类型的任何一边都是“Scalene”。我们也可以直接使用 ELSE 。

Answer 3

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

步骤1：首先我们选择案例来检查给定输入是否为三角形
步骤2：如果是三角形，则检查其类型。所以第一种情况如果所有边都相同，那么三角形类型是'Equilateral'，那么第二种情况如果任何两边相同则三角形类型是'Isosceles'，否则三角形类型是{{1 }}

Answer 4

SELECT
CASE
    WHEN (A > 0 AND B > 0 AND C > 0 AND (A + B > C) AND (B + C > A) AND (A + C > B)) 
    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;

Answer 5

对于Oracle 11g，这是有效的：

SELECT CASE WHEN A+B>C then case when A=B AND B=C THEN 'Equilateral'
   WHEN A=B OR B=C OR A=C THEN 'Isosceles'
   WHEN A!=B or B!=C OR A!=C THEN 'Scalene' END
   ELSE 'Not A Triangle' END
   FROM TRIANGLES;

Answer 6

{{1}}

这里，它会严格检查三角形的类型。

Answer 7

您的答案实际上是正确的。但是在以下问题上缺少一个（三角形的“正确的定义”）的信息（这不是您的错），即如果双方的和大于或等于另一方，则不是三角形

您唯一需要做的就是将'='放在'<'

附近

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"  
  when A<>B and B<>C then "Scalene" 


 end as triangles_type 
from TRIANGLES;

Answer 8

尝试下面提到的查询。这肯定会奏效。

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;

说明：

首先检查这些值是否满足三角形的要求（即两条边之和必须大于另一边）

如果上述条件成立，则寻找三角形的类型

等边 - 所有边都相等
等腰线 - 任何两条边都相等
Scalene - 所有三个方面都不同

如果上述条件为假，则

不是三角形

Answer 9

scipy_kurtosis()

Answer 10

通过了所有测试用例的MySQL：-

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' 
WHEN A != B OR B != C OR A != C THEN 'Scalene' 
END ELSE 'Not A Triangle' END FROM TRIANGLES;

Answer 11

MySQL：

select
case 
    when ((A+B)<=C) || ((C+B)<=A) || ((A+C)<=B)  then 'Not A Triangle'
    when A=B && B=C && A=C then 'Equilateral'
    when ((A=B) && (A+B)>C) || ((B=C) && (B+C)>A)  then 'Isosceles'    
    when A!=B && B!=C && A!=C then 'Scalene' 
    end
from TRIANGLES;

说明：

首先，检查值是否满足三角形的要求（即，两个边的总和必须大于另一边）-非三角形

然后，寻找三角形的类型

等边-各方平等
等腰线-任何两个边都是相等的（包括两个边的和大于另一个边的附加条件-当我们检查三角形的基本规则作为第一种情况时，可以忽略不计）< / li>
Scalene -所有三个方面都不同

Answer 12

/ *下面的代码将检查三角形的所有可能情况，此代码将100％起作用* /

select case
when A+B<=C OR A+C<=B OR C+B<=A THEN "Not A Triangle"
when (A<>B AND A+B>C) AND (B<>C AND B+C>A) AND (A<>C AND A+C>B) THEN 
"Scalene"
when (A=B AND B<>C AND A+B>C) OR (B=C AND B<>A AND B+C>A) OR (A=C AND C<>B 
AND A+C>B) THEN "Isosceles"
when A=B AND B=C THEN "Equilateral"
end as triangle
from TRIANGLES;

Answer 13

对于MySQL：

select
  case
      when (a+b>c) and (a+c>b) and (b+c>a) then
           case
              when (a=b) and (b=c) and (a=c) then 'Equilateral'
              when (a=b) or (b=c) or (a=c) then 'Isosceles'
              else 'Scalene'
           end
       else 'Not A Triangle'
    end    
from TRIANGLES

Answer 14

选择案件当a = b和b = c时，则为“等边” 当a + b <= c或b + c <= a或a + c

Answer 15

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

Answer 16

SELECT CASE
WHEN (A + B <= C) OR (B+C <= A) OR (A+C <= B) THEN "Not A Triangle" 
WHEN (A=B) AND (B=C) THEN "Equilateral"
WHEN (A=B) OR (C=A) OR (B=C) THEN "Isosceles" 
ELSE "Scalene" 
END 
FROM TRIANGLES

Answer 17

选择IF（A + B＆gt; C和A + C＆gt; B和B + C＆gt; A，IF（A = B和B = C，'等边'，IF（A = B或B = C或A =来自三角形的C，'Isosceles'，'Scalene'）），'不是三角';

Answer 18

select 
case
    when (a+b>c) and (b+c>a) and (c+a>b) then
        case
            when a=b and b=c then 'Equilateral'
            when a=b or b=c or c=a then 'Isosceles'
            else 'Scalene'
        end
    else 'Not A Triangle'
end 
from triangles;

Answer 19

select CASE WHEN ((A+B)<=C OR (B+C)<=A OR (A+C)<=B ) THEN 'Not A Triangle'
       ELSE (case when (A=B) AND (B=C) AND (A=C) THEN 'Equilateral'
        WHEN (A=B) OR (B=C) OR (A=C) THEN 'Isosceles'
        WHEN (A<>B) AND (B<>C) AND (A<>C) THEN 'Scalene'
        END )
        END TYPET
FROM TRIANGLES

1. CHECK IF IT IS NOT A TRIANGLE
2. ELSE CHECK IF ALL SIDES ARE EQUAL THEN  'Equilateral'
3. IF ONLY TWO SIDES ARE EQUAL THEN Isosceles
4. IF NO SIDES ARE EQUAL THEN 'Scalene'

Answer 20

这个答案在sql * plus中运行良好，但在hackerrank中却不行，我不知道为什么？试试这个。

declare
 cursor mytriangle is select A,B,C from triangles;
 a triangles.A %type;
 b triangles.B %type;
 c triangles.C %type;
 begin
 open mytriangle;
 if mytriangle%isopen then
 loop
 fetch mytriangle into a,b,c;
 exit when mytriangle %notfound;
 case
 when a+b<=c or b+c<=a or a+c<=b then
 dbms_output.put_line('Not A Triangle');
 when a=b and b=c then
 dbms_output.put_line('Equilateral');
 when a=b or b=c or c=a then
 dbms_output.put_line('Isoceles');
 when a+b>=c and b+c>=a and a+c>=b and a!=b and b!=c and c!=a then
 dbms_output.put_line('Scalene');
 else
 dbms_output.put_line('');
 end case;
 end loop;
 close mytriangle;
 else dbms_output.put_line('cannot open the cursor');
 end if;
end;

MYSQL中的三角形类型

20 个答案: