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Asked: 2026-05-11T03:24:47+00:00

I have a Linq to SQL query that was working just fine with SQL

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I have a Linq to SQL query that was working just fine with SQL Server 2005 but, I have to deploy the web app with a SQL Server 2000 and, when executing that query, I get his error:

‘System.Data.SqlClient.SqlException: The column prefix ‘t0′ does not match with a table name or alias name used in the query.’

I have more queries but it doesn’t seems to have problems with those. Now, this is the query:

from warningNotices in DBContext_Analyze.FARs where warningNotices.FAR_Area_ID == filter.WarningAreaID &&       warningNotices.FAR_Seq == filter.WarningSeq &&       warningNotices.FAR_Year == filter.WarningYear       orderby warningNotices.FAR_Seq ascending       select new Search_Result       {         FAR_Area_ID = warningNotices.FAR_Area_ID,         FAR_Seq = warningNotices.FAR_Seq,         FAR_Year = warningNotices.FAR_Year,         DateTime_Entered = (DateTime)warningNotices.DateTime_Entered == null ?   DateTime.MaxValue : (DateTime)warningNotices.DateTime_Entered,         Time_Entered = warningNotices.Time_Entered,         OrigDept = warningNotices.OrigDept,         Part_No = warningNotices.Part_No,         DateTime_Analyzed = (DateTime)warningNotices.DateTime_Analyzed == null ? DateTime.MaxValue : (DateTime)warningNotices.DateTime_Analyzed,         Analyzed_By = warningNotices.Analyzed_By,         MDR_Required = (Char)warningNotices.MDR_Required == null ? Char.MinValue : (Char)warningNotices.MDR_Required,         Resp_Dept = (from FARSympt in DBContext_Analyze.FAR_Symptoms                      where FARSympt.FAR_Area_ID == warningNotices.FAR_Area_ID &&                    FARSympt.FAR_Year == warningNotices.FAR_Year &&                    FARSympt.FAR_Seq == warningNotices.FAR_Seq                  select new { FARSympt.Resp_Dept}).FirstOrDefault().Resp_Dept,         Sympt_Desc = (from SymptomsCatalog in DBContext_Analyze.Symptoms               where SymptomsCatalog.symptom_ID == filter.Status_ID                   select new {                                         SymptomsCatalog.Sympt_Desc                                      }).FirstOrDefault().Sympt_Desc,         Status_ID = warningNotices.Status.HasValue ? warningNotices.Status.Value : 0         };

Previously I had a ‘Distinc’ in the subquery for the Resp_Dept field, but I removed it.

Any ideas? Thanks in advance for your comments =)

This is query I get from the SQL Server profiler:

exec sp_executesql N'SELECT [t0].[FAR_Seq], [t0].[FAR_Year],      (CASE          WHEN ([t0].[DateTime_Entered]) IS NULL THEN @p3         ELSE [t0].[DateTime_Entered]      END) AS [DateTime_Entered], [t0].[Time_Entered], [t0].[OrigDept], [t0].[Part_No],      (CASE          WHEN ([t0].[DateTime_Analyzed]) IS NULL THEN @p4         ELSE [t0].[DateTime_Analyzed]      END) AS [DateTime_Analyzed], [t0].[Analyzed_By],      (CASE          WHEN (UNICODE([t0].[MDR_Required])) IS NULL THEN @p5         ELSE CONVERT(NChar(1),[t0].[MDR_Required])      END) AS [MDR_Required], (     SELECT [t2].[Resp_Dept]     FROM (         **SELECT TOP (1)** [t1].[Resp_Dept]         FROM [dbo].[FAR_Symptoms] AS [t1]         WHERE (UNICODE([t1].[FAR_Area_ID]) = UNICODE([t0].[FAR_Area_ID])) AND ([t1].[FAR_Year] = [t0].[FAR_Year]) AND ([t1].[FAR_Seq]  = [t0].[FAR_Seq])         ) AS [t2]     ) AS [Resp_Dept], (     SELECT [t4].[Sympt_Desc]     FROM (         **SELECT TOP (1)** [t3].[Sympt_Desc]         FROM [dbo].[Symptoms] AS [t3]         WHERE [t3].[symptom_ID] = @p6         ) AS [t4]     ) AS [Sympt_Desc], [t0].[FAR_Area_ID],      (CASE          WHEN [t0].[Status] IS NOT NULL THEN [t0].[Status]         ELSE @p7      END) AS [Status_ID] FROM [dbo].[FARs] AS [t0] WHERE (UNICODE([t0].[FAR_Area_ID]) = @p0) AND ([t0].[FAR_Seq] = @p1) AND ([t0].[FAR_Year] = @p2) ORDER BY [t0].[FAR_Seq]',N'@p0 int,@p1 int,@p2 varchar(2),@p3 datetime,@p4 datetime,@p5 nchar(1),@p6 int,@p7  int',@p0=76,@p1=7204,@p2='08',@p3=''9999-12-31 23:59:59:997'',@p4=''9999-12-31 23:59:59:997'',@p5=N' ',@p6=0,@p7=0

The only think that I see there that may not in SQL Server 2000 is the ‘()’ in the ‘Select top…’ but I’m not sure if that is what is causing the problem and, also, I don’t know how that could be fixed =S

Thanks again =)

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1 Answer

  1. after several testing and review the DB, I found that the problem was a legacy table I was working on: that table has ‘text’ type fields. Also, I had to remove some ‘Distinct‘ instructions in a nested query I had.

    I found this and, after review that, I found that I have to change my queries and that the ‘Distinct’ instruction does not work correctly. As a side note, let me say that the nested queries can also generate unexpected behavior.

    So, the real lesson here is that if you need to deploy this against a SQL Server 2000, set an instance of the server and test against it!!! XD

    Thanks a lot of your help =)

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