Question

可能重复：
trim left characters in sql server?

我在下面有一个查询，从我们的数据库中获取客户信息以发送优惠券。关于邮政编码，我们只想要该字段的前5位数...如何只返回前5位？我的代码如下：

SELECT        Invoice_Tb.Customer_First_Name AS firstname, Invoice_Tb.Customer_Last_Name AS lastname, Invoice_Tb.Customer_Address AS add1, Invoice_Tb.City, 
                         Invoice_Tb.Customer_State AS State, Invoice_Tb.ZIP_Code AS ZIP, Invoice_Tb.Customer_Email_Address AS [Email Address], 
                         Invoice_Tb.Vehicle_Mileage AS [Vehicle Mileage], Invoice_Tb.Invoice_Date AS [Date Of Service], Invoice_Tb.Store_Number, @startdate AS Start_Date, @enddate AS End_Date
FROM            Invoice_Detail_Tb INNER JOIN
                         Invoice_Tb ON Invoice_Detail_Tb.Invoice_Number = Invoice_Tb.Invoice_Number AND Invoice_Detail_Tb.Invoice_Date = Invoice_Tb.Invoice_Date
WHERE        (Invoice_Detail_Tb.Store_Category_Code = 'FS') AND (Invoice_Tb.Invoice_Date BETWEEN CONVERT(DATETIME, @startdate, 102) AND CONVERT(Datetime, 
                         @enddate, 102)) AND (Invoice_Tb.Reminder_Mail_Flag = 'Y')

Answer 1

尝试

LEFT(FieldName, 5)

e.g。

SELECT LEFT(FieldName, 5) as SomeAlias FROM SomeTable

表：

FieldName
---------
Hello World

结果：

SomeAlias
---------
Hello

Answer 2

如果您的字段是Invoice_Tb.ZIP_Code，则可以使用子字符串函数：

substring(Invoice_Tb.ZIP_Code, 1, 5) AS 'Trimmed Zip Code'

另一种选择是使用LEFT功能：

LEFT(Invoice_Tb.ZIP_Code, 5) AS 'Trimmed Zip Code'

由于存在从整数到nvarchar和nvarchar等效的隐式转换，因此无需担心在此处执行CAST。

如何只显示查询中字段的前5位数字

2 个答案: