我得到这个错误,因为我有一个列的类型为“文本”的sql Server表.
The text data type cannot be selected as DISTINCT because it is not comparable
任何方式来解决这个问题而不改变数据类型？
这是我的linq语句(很长)：
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();
解决方法
简单的答案是“不要使用文字”.
当sql Server 2005发布时,varchar(max) 6年7年和3版本(2012年5月编辑)已被弃用.
你有的代码是发出SELECT DISTINCT.您需要修复模型/表,因此它不是文本数据类型
