conversiontype的SQL Server查询错误

我在SQL Server中得到一个代码错误

SQL代码：

SELECT DISTINCT  
    HEADER.PONUMBER, 
    SName,
    CompanyName
FROM 
    HEADER 
INNER JOIN 
    PDetails  ON HEADER.PONUMBER = PDetails.PoNumber 
INNER JOIN 
    FAN_P ON PDetails.PurchaseOrderID = FAN_P.PurchaseOrderID      

错误消息：

将varchar值“PO321211”转换为数据类型int时，转换失败

你能帮我拿这个吗

谢谢

检查的数据类型

HEADER.PONUMBER
Details.PoNumber

及

像这样

SELECT DISTINCT HEADER.PONUMBER,SName,CompanyName
           FROM HEADER
     INNER JOIN PDetails 
             ON HEADER.PONUMBER = concat(PDetails.PoNumber, '') 
     INNER JOIN FAN_P 
             ON PDetails.PurchaseOrderID = FAN_P.PurchaseOrderID

或

---

错误很明显。您正在尝试将and

INT

列与

VARCHAR

列进行比较。为了缓解这种情况，您可以将比较转换为varchar。我都做了，因为我不知道是哪一个导致了错误。。。但它是包含

PO321211

的列：）

---

你好，Christian，HEADER.PONUMBER是VARCHAR2，DETAILS.PONUMBER是INT。试着在join中使用HEADER.PONUMBER=concat（PDetails.PONUMBER，''）你能详细说明一下吗？感谢这样从HEADER上的HEADER内部连接PDetails中选择不同的HEADER.PONUMBER、SName、CompanyName。PONUMBER=concat（PDetails.PONUMBER“”）PDetails上的内部连接FAN_P。PurchaseOrderID=FAN_P.PurchaseOrderID检查编辑过的答案这不起作用，从HEADER上的HEADER内部联接PDetails中选择DISTINCT HEADER.PONUMBER、SName、CompanyName。PONUMBER=concat（“PO”，PDetails.PONUMBER”）PDetails.PurchaseOrderID=FAN\P.PurchaseOrderID上的内部联接FAN\P

SELECT DISTINCT HEADER.PONUMBER,SName,CompanyName
           FROM HEADER
     INNER JOIN PDetails 
             ON HEADER.PONUMBER = concat(PDetails.PoNumber, '') 
     INNER JOIN FAN_P 
             ON PDetails.PurchaseOrderID = FAN_P.PurchaseOrderID

SELECT DISTINCT HEADER.PONUMBER, SName, CompanyName 
           FROM HEADER
     INNER JOIN PDetails 
             ON HEADER.PONUMBER = concat('PO',PDetails.PoNumber) 
     INNER JOIN FAN_P 
             ON PDetails.PurchaseOrderID = FAN_P.PurchaseOrderID 

SELECT  DISTINCT  HEADER.PONUMBER, 
                  SName,
                  CompanyName
FROM HEADER INNER JOIN PDetails 
ON CAST(HEADER.PONUMBER AS VARCHAR(128)) = CAST(PDetails.PoNumber AS VARCHAR(128))
INNER JOIN FAN_P ON CAST(PDetails.PurchaseOrderID AS VARCHAR(128)) = CAST(FAN_P.PurchaseOrderID AS VARCHAR(128))