We had this annoying problem: a simple query in Access to a linked table (using ODBC and MS SQL server) returned incorrect results, though the same query returned correct results in MS SQL server. By incorrect I mean the field values were different, so rather than returning AZ, the query returned BZ (some other value in that field).
We thought that it was a table size issue, may be the driver could not handle huge data. However, the problem was with the “unique record identifier” while linking the table, as JM reported here. I did not have this problem any longer when I did not select any fields for the unique record identifier while linking the table.
Well, I got this error message today while I was trying to import a text file:
“The search key was not found in any record”
After some research, I found that either it was a bug caused by Microsoft Jet 4.0 Service Pack or it was the size of the database (should be not greater than 2GB). It turned out to be the later one. I fixed this problem by compacting and resizing the database. In Access 2007, you click on the Office Button (Top Left Corner), then Manage > Compact and Repair Database.
When I tried to export a table/query from Access 2007 to Excel 2007, I was getting this annoying error:
You selected more records than can be copied onto the Clipboard at one time. Divide the records into two or more groups, and then copy and paste one group at a time. The maximum number of records you can paste at one time is approximately 65,000.
Access 2007 Export to Excel Error
I was unable to understand the reason, because I thought Excel 2007 did not limit number of rows to 65,536. It turns out however that it is the clipboard limitation.
Solution: If you check off the “export data with formatting and layout” option, Access exports successfully.
You can export successfully using Transferspreadsheet (VBA) option too.
Here is the KB from MS.
Solution Update:Thanks to Brett, it looks like that only if you export table/query using right click > Export and have the checkbox cleared, then Access will export succesfully. That is what I always do, and it works for me. I have never tried External data option for exporting.
Weka, an open source data mining software, uses arff input data format. You can use this code to convert any Access table to arff format. Download the Access database with code: Convert2Arff.mdb
This can very well be designed using forms, but this should get one started. Use Alt + F11 to see the code, then execute procedure ConvertTbl2Arff to convert a table.
Some highlights of this procedure
- Takes care of spaces in Attribute name and data values
- Finds unique values of nominal variables
- Assigns equivalent ARFF datatype
- Replaces missing values with question marks
If you want to export Access tables using ODBC/DSN connections, use the following code. This procedure uses the File DSN and ODBC connection to export Access tables using DAO object TableDef.
Sub ExportTbls()
Dim sTblNm As String
Dim sTypExprt As String
Dim sCnxnStr As String, vStTime As Variant
Dim db As Database, tbldef As DAO.TableDef
On Error GoTo ExportTbls_Error
sTypExprt = “ODBC Database” ‘Export Type
sCnxnStr = “ODBC;DSN=DSNName;UID=userID;PWD=password” ‘Create the connection string
vStTime = Timer
Application.Echo False, “Visual Basic code is executing.”
Set db = CurrentDb()
‘need a reference to Microsoft DAO 3.x library
For Each tbldef In db.TableDefs
‘Don’t export System and temporary tables
If Left(tbldef.Name, 4) “MSys” And Left(tbldef.Name, 4) “~TMP” Then
‘Debug.Print tbldef.Name
sTblNm = tbldef.Name
DoCmd.TransferDatabase acExport, sTypExprt, sCnxnStr, acTable, sTblNm, sTblNm
End If
Next tbldef
MsgBox “Done! Time taken=” & Timer – vStTime
On Error GoTo 0
SmoothExit_ExportTbls:
Set db = Nothing
Application.Echo True
Exit Sub
ExportTbls_Error:
MsgBox “Error ” & Err.Number & ” (” & Err.Description & “) in procedure ExportTblsODST”
Resume SmoothExit_ExportTbls
End Sub
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