Question

以下案例陈述有效，返回Yes，col1的值= 1。如何在col2？

中包含第二个

SELECT CASE 
WHEN col1= '1' THEN 'Yes' ELSE 'No' END 
FROM PROVIDERS
WHERE NAME = 'Hospital1'

以下给出了错误

 SELECT CASE 
(WHEN col1= '1' THEN 'Yes' ELSE 'No' END) as 1st,
(WHEN col2= '1' THEN 'Yes' ELSE 'No' END) as 2nd
    FROM PROVIDERS
WHERE NAME = 'Hospital1'

Answer 1

第二栏

错过了

CASE

SELECT 
       CASE WHEN col1 = '1' THEN 'Yes' ELSE 'No' END AS 1st,
       CASE WHEN col2 = '1' THEN 'Yes' ELSE 'No' END AS 2nd
FROM   PROVIDERS
WHERE  NAME = 'Hospital1'

Answer 2

格式正确：

SELECT CASE 
        WHEN col1 = '1'
            THEN 'Yes'
        ELSE 'No'
        END AS 1st
    ,CASE 
        WHEN col2 = '1'
            THEN 'Yes'
        ELSE 'No'
        END AS 2nd
FROM PROVIDERS
WHERE NAME = 'Hospital1'

结合这两种情况时的陈述

2 个答案: