SELECT语句中的TRIM特定列名

Question

我有一张桌子＆＃34;用户＆＃34;包含5列＆＃39; ID＆＃39;，＆＃39;名字＆＃39;，＆＃39;姓氏＆＃39;，＆＃39;年龄＆＃39;＆＃39;电子邮件＆＃39;。

是否可以执行此sql命令？

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

我需要选择的是3个被修剪的列。

Answer 1

您需要单独修剪每个字段

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

Answer 2

您必须单独处理每个列，如：

SELECT LTRIM(RTRIM(firstname)) as firstname,
       LTRIM(RTRIM(lastname)) as lastname,
       LTRIM(RTRIM(email)) as 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

您需要单独对所有列进行TRIM。