EF:无法将文本数据类型选择为DISTINCT，因为它不可比较 [英] EF: The text data type cannot be selected as DISTINCT because it is not comparable
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问题描述
我收到此错误，因为我有一个SQL Server表，该表的列类型为文本".
I get this error because I have a SQL Server table with a column of type "text".
The text data type cannot be selected as DISTINCT because it is not comparable
有什么方法可以解决此问题而不更改数据类型?
Any way to resolve this without changing the data type?
这是我的linq语句(很长):
Here is my linq statement (it's long):
var query = (from s in db.tblSuppliers
join p in
(
from p1 in db.tblSupplierPricingSchemes
select new
{
p1.SupplierID,
p1.PSLangPairID,
p1.CustomerID,
p1.PSLanguageStatus,
p1.PSPriceBasis,
p1.PSMinFlatCharge,
p1.PSTrxPrf,
p1.PSNoMatch,
p1.PSFuzzy,
p1.PS100Match_Rep,
p1.PSTrxOnly,
p1.PSPrfOnly,
p1.PSLinquisticHourlyRate,
p1.PSDTPType,
p1.PSDTPRate,
p1.PS_FZ50,
p1.PS_FZ75,
p1.PS_FZ85,
p1.PS_FZ95,
p1.PS_FZ100,
p1.PS_FZREPS,
p1.PSPerfectMatch
}
) on s.SupplierID equals p.SupplierID
join p2 in
(
from p in db.tblSupplierPricingSchemes
where custID.Contains(p.CustomerID) && p.PSLangPairID == languagePairID
group p by new { p.SupplierID, p.PSLangPairID, p.PSPriceBasis } into g
let CustomerID = g.Max(uh => uh.CustomerID)
select new
{
g.Key.SupplierID,
g.Key.PSLangPairID,
g.Key.PSPriceBasis,
CustomerID
}
) on p.SupplierID equals p2.SupplierID
join b in db.tblPricingBasis on p.PSPriceBasis equals b.PricingBasisID
join ss in db.tblSupplierStatus on p.PSLanguageStatus equals ss.SupplierStatusID into g1
from ss in g1.DefaultIfEmpty()
join l in db.tblLangPairs on p.PSLangPairID equals l.ProductID
where l.ProductID == languagePairID
&& p.PSLangPairID == p2.PSLangPairID
&& p.CustomerID == p2.CustomerID
&& p.PSPriceBasis == p2.PSPriceBasis
select new PreferredSupplier
{
SupplierID = s.SupplierID,
//SupplierName = s.CompanyName != null ? s.CompanyName + "-" + s.SupplierFirstName + " " + s.SupplierLastName
// : s.SupplierFirstName + " " + s.SupplierLastName,
SupplierName = s.CompanyName != null
? s.SupplierFirstName != null || s.SupplierLastName != null
? s.CompanyName + "-" + s.SupplierFirstName + " " + s.SupplierLastName
: s.CompanyName
: s.SupplierFirstName + " " + s.SupplierLastName,
CompanyName = s.CompanyName,
SupplierFirstName = s.SupplierFirstName,
SupplierLastName = s.SupplierLastName,
SupplierStatus = p.CustomerID == customerID ? "Team Member" : ss.SupplierStatus,
Email = (string)s.SupplierEmails,
Rate = (s.VolumeDiscountType == 1 ? // Percentage
//if the volume discount is as percentage then get the rate and multiple it by 1 - the discount percentage
((words > s.VolumeDiscountAmount && (task == "TM No Match" || task == "Translation/Proofreading")) ? 1 - s.VolumeDiscountValue : 1) *
(
rateField == "PSTrxPrf" ? p.PSTrxPrf :
rateField == "PSNoMatch" ? p.PSNoMatch :
rateField == "PSFuzzy" ? p.PSFuzzy :
rateField == "PS100Match_Rep" ? p.PS100Match_Rep :
rateField == "PSLinquisticHourlyRate" ? p.PSLinquisticHourlyRate :
rateField == "PSDTPRate" ? p.PSDTPRate :
rateField == "PS_FZ50" ? p.PS_FZ50 :
rateField == "PS_FZ75" ? p.PS_FZ75 :
rateField == "PS_FZ85" ? p.PS_FZ85 :
rateField == "PS_FZ95" ? p.PS_FZ95 :
rateField == "PS_FZ100" ? p.PS_FZ100 :
rateField == "PS_FZREPS" ? p.PS_FZREPS :
rateField == "PSPerfectMatch" ? p.PSPerfectMatch : null
) :
// Discount in Amount
// Take the Rate and substract the amount to discount
(
rateField == "PSTrxPrf" ? p.PSTrxPrf :
rateField == "PSNoMatch" ? p.PSNoMatch :
rateField == "PSFuzzy" ? p.PSFuzzy :
rateField == "PS100Match_Rep" ? p.PS100Match_Rep :
rateField == "PSLinquisticHourlyRate" ? p.PSLinquisticHourlyRate :
rateField == "PSDTPRate" ? p.PSDTPRate :
rateField == "PS_FZ50" ? p.PS_FZ50 :
rateField == "PS_FZ75" ? p.PS_FZ75 :
rateField == "PS_FZ85" ? p.PS_FZ85 :
rateField == "PS_FZ95" ? p.PS_FZ95 :
rateField == "PS_FZ100" ? p.PS_FZ100 :
rateField == "PS_FZREPS" ? p.PS_FZREPS :
rateField == "PSPerfectMatch" ? p.PSPerfectMatch : null
) - (s.VolumeDiscountValue == null ? 0 : s.VolumeDiscountValue)),
//PSMinFlatCharge = p.PSMinFlatCharge,
MinimumFee = p.PSMinFlatCharge,
//Basis = b.PricingBasisDesc,
Basis = task == "DTP" || task == "DTP Edit" ? p.PSDTPType : b.PricingBasisDesc,
StatusOrder = p.CustomerID == customerID ? 0 : p.PSLanguageStatus == null ? 1000 : p.PSLanguageStatus
}).Distinct();
推荐答案
简单的答案是不使用文字".
Simple answer is "don't use text".
几年前，当 varchar(max)弃用时Server 2005已发布.
It was deprecated for varchar(max) years ago when SQL Server 2005 was released.
您拥有的代码正在发出SELECT DISTINCT.
您需要修复模型/表格，使其不是text数据类型
The code you have is issuing SELECT DISTINCT.
You need to fix the model/tables so it isn't text datatype
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