除非使用IS NULL或LIKE运算符,否则无法比较或排序text,ntext和image数据类型。 [英] The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator.
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问题描述
Use Shoppingkart
select P.ProductSNo,
P.ProductName,
P.ProductDescription,
P.ProductPrice,
P.ProductImage,
P.CategorySNo,
P.CategorySNo,
P.ProductQuantity,
C.CategoryName,
Isnull(Sum(CP.TotalProducts),0) as ProductSold
From Products P
Inner Join Category C
On P.CategorySNo=C.CategorySNo
LEFT Join CustomerProducts CP
On P.ProductSNo=CP.ProductSNo
Group BY
P.ProductSNo,
P.ProductName,
P.ProductDescription,
P.ProductPrice,
P.ProductImage,
P.CategorySNo,
P.ProductQuantity,
C.CategoryName
我收到此错误::
I got This error::
The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator.
推荐答案
正如错误所述,某些数据类型无法比较。在你的陈述中我猜它是P.ProductImage
。
一个选项是你首先选择'正常'数据然后使用该结果集并将其与图像数据组合。换句话说,比如
As the error says, some of the data types aren't comparable. In your statement I'd guess it'sP.ProductImage
.
One option is that you first select the 'normal' data and then use that result set and combine it with the image data. In other words, something like
select a.*,
(select p.productimage
from product p
where p.productsno = a.productsno) AS ProductImage
from (
select P.ProductSNo,
P.ProductName,
P.ProductDescription,
P.ProductPrice,
P.CategorySNo,
P.CategorySNo,
P.ProductQuantity,
C.CategoryName,
Isnull(Sum(CP.TotalProducts),0) as ProductSold
From Products P
Inner Join Category C
On P.CategorySNo=C.CategorySNo
LEFT Join CustomerProducts CP
On P.ProductSNo=CP.ProductSNo
Group BY
P.ProductSNo,
P.ProductName,
P.ProductDescription,
P.ProductPrice,
P.CategorySNo,
P.ProductQuantity,
C.CategoryName) a
示例中的连接列可能不正确,但您知道结构更好的数据库:)
The joining column may be incorrect in the example, but you know the structure of the database better :)
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