將數據類型varchar轉換爲浮點時出錯

Question

我有以下SQL語句給我這個錯誤。

「錯誤轉換數據類型爲varchar漂浮」在這一行

, pe.ProductWeight + ' lb' AS weight 

我意識到這是錯誤的，但我不知道如何「磅」添加到權重值。任何幫助，將不勝感激。

SELECT p.ProductCode AS id 

, p.ProductName AS title 

, 'Home & Garden > Household Appliance Accessories > Laundry Appliance Accessories' AS product_type 

, IsNull(pe.SalePrice,pe.ProductPrice) AS price 

, IsNull(pe.ProductManufacturer,'n/a') AS brand 

, IsNull(pe.ProductCondition,'new') AS condition 

, CONVERT(VARCHAR(10), (GETDATE() + 30),120) AS expiration_date 

, pd.ProductDescriptionShort AS [stripHTML-description] 

, 'http://www.thesite.com/v/vspfiles/photos/' + IsNull(p.Vendor_PartNo,p.ProductCode) + '-2.jpg' AS image_link 

, 'http://www.thesite.asp?ProductCode=' + p.ProductCode + '&Click=1327' AS link 

, pe.ProductWeight + ' lb' AS weight 


FROM Products p 

INNER JOIN Products_Descriptions pd ON p.ProductID = pd.ProductID 

INNER JOIN Products_Extended pe ON pd.ProductID = pe.ProductID 

WHERE (p.IsChildOfProductCode is NULL OR p.IsChildOfProductCode = ' AND (p.HideProduct is NULL OR p.HideProduct <> 'Y') 

AND (pe.ProductPrice > 0) 

ORDER BY p.ProductCode 

Answer 1

如果你想連接一個float和一個字符串，你需要將浮動轉換爲字符串第一：

CAST(pe.ProductWeight AS VARCHAR(20)) + ' lb' AS weight 

Answer 2

的Varchar比浮動的優先級低，所以它正試圖把'磅'成浮動和失敗。

請參閱http://msdn.microsoft.com/en-us/library/ms190309.aspx進行排名。