SELECT語句中的TRIM特定列名稱

Question

我有一個包含5列「id」，「firstname」，「lastname」，「age」，「email」的表格「User」。

是否可以執行此sql命令？

SELECT LTRIM(RTRIM(firstname,lastname,email)) FROM User 

所有我需要選擇的是3列修剪。

Answer 1

你必須單獨處理每個列，如：

SELECT LTRIM(RTRIM(firstname)) as firstname, 
     LTRIM(RTRIM(lastname)) as lastname, 
     LTRIM(RTRIM(email)) as email 
FROM [User] 

Answer 2

您需要修剪每個字段單獨

select ltrim(rtrim(firstname)), ltrim(rtrim(lastname)), ltrim(rtrim(email)) 
from User 

Answer 3

使用此：

SELECT 
     LTRIM(RTRIM(FirstName)) AS FirstName, 
     LTRIM(RTRIM(LastName)) AS LastName, 
     LTRIM(RTRIM(Email)) AS Email 
FROM User 

你需要做的TRIM將所有列分開。