I really don't know if anyone would ever need to do this again, but I just thought to share what I came up with in case it may be useful to someone else. The following function is very basic and does not include any error handling. Hopefully, you can modify it to suit your needs. I would happily accept any comments or recommendations to improve this function to better help those who may want to use it.
Public Function DDiff(strField As String, strDomain As String, _ Optional strCriteria As String) As Variant 'accessmvp.com/thedbguy '7/26/2013 Dim dbs As DAO.Database Dim rst As DAO.Recordset Dim strSQL As String Dim varDiff As Variant strSQL = "SELECT [" & strField & "] FROM [" & strDomain & "] " If strCriteria > "" Then strSQL = strSQL & " WHERE " & strCriteria End If Set dbs = CurrentDb Set rst = dbs.OpenRecordset(strSQL, dbOpenSnapshot) With rst If Not (.BOF And .EOF) Then varDiff = .Fields(strField) .MoveNext End If Do While Not .EOF varDiff = varDiff - .Fields(strField) .MoveNext Loop .Close End With DDiff = varDiff Set rst = Nothing Set dbs = Nothing End Function
To see the discussion that started it all, including a pure SQL solution, click here.
Original post date: July 27, 2013