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Excel - Inner Join

Posted on 2011-02-24
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Last Modified: 2012-05-11
Hi,

Is there a way in Excel to create an inner join on two spreadsheets, and output to a third spreadsheet?

Thank you.
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Question by:tahirih
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zorvek (Kevin Jones) earned 500 total points
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The routine below runs a SQL command against any workbook, open or closed, and returns the result into a destination range, an array, or as a recordset. The code can be placed in any general module. See the comments in the routine for more information about the parameters.

Below is an example using it to do an inner join using tables residing in the workbook in which the code resides.

   RunSQLQuery ThisWorkbook, "SELECT T1.Field1, T1.Field2, T2.Field2 FROM [Sheet1$A1:B100] AS T1 INNER JOIN [Sheet2$A1:B100] AS T2 ON T1.Field1=T2.Field1", Sheets("Sheet3").[A1], True, True

Below is the code for the routine.

[Begin Code Segment]

Public Sub RunSQLQuery( _
      ByVal SourceWorkbookPath As String, _
      ByVal SQLCommand As String, _
      ByRef Destination As Variant, _
      Optional TablesHaveHeaders As Boolean = True, _
      Optional WriteHeader As Boolean _
   )

' Run SQL command against one or more tables in a workbook and write the
' resulting recordset to the range starting at the destination specified.
'
' Syntax
'
' RunSQLQuery(SourceWorkbookPath, SQLCommand, Destination, [WriteHeader])
'
' SourceWorkbookPath - The full path to the workbook in which the source tables
'   reside. The workbook must have been previously saved to disk (although the
'   most current version does not need to be saved to get the most recent
'   data). To get the full path for an open workbook using the workbook object
'   use:
'      SourceWorkbookPath.Path & "\" & SourceWorkbookPath.Name
'   The source workbook can be open or closed.
'
' SQLCommand - Any valid SQL command. Reference tables either by cell
'   reference:
'      SELECT * FROM [Sheet1$A1:C100]
'   or by range name:
'      SELECT * FROM [Table1]
'   Field names are determined by the values in the first row of each table. To
'   reference a field name use square brackets around the name:
'      SELECT T1.[FieldName] FROM [Table1] AS T1
'
' Destination - Any valid range or a variant variable. If a range is passed
'   then the resulting recordset is copied to the cells starting at the top
'   left cell in Destination. As many cells are used as are needed. If an empty
'   array is passed (UBound = -1) then the query result is returned as an
'   array. Otherwise the resulting recordset is returned in Destination.
'
' TablesHaveHeaders - Pass True if the source tables have a header row. Pass
'   False if not. Optional. If omitted then True is assumed. If the source
'   tables do not have headers then the columns are named "F1", "F2", etc.
'
' WriteHeader - Pass True to write a header row, False to not write the
'   headers. Optional. If omitted then False is assumed.

   Dim RecordSet As Object ' ADODB.RecordSet
   Dim ConnectionString As String
   Dim Column As Long
   Dim Row As Long
   Dim ReturnArray As Boolean
   Dim RecordCount As Long
   
   Set RecordSet = CreateObject("ADODB.RecordSet") ' New ADODB.RecordSet
   
   If IsArray(Destination) Then
      If UBound(Destination) = -1 Then ReturnArray = True
   End If
   
   ' Open the ADODB connection and run the query
   ConnectionString = _
      "Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=" & SourceWorkbookPath & ";" & _
      "Extended Properties='Excel 8.0;HDR=" & IIf(TablesHaveHeaders, "Yes", "No") & "'"
   RecordSet.Open SQLCommand, ConnectionString, 2, 1, 1 ' adOpenDynamic, adLockReadOnly, adCmdText
   
   ' Handle the results according to what was passed in Destination
   If TypeName(Destination) = "Range" Then
      ' Copy recordset to range
      Application.ScreenUpdating = False
      If WriteHeader Then
         For Column = 1 To RecordSet.Fields.Count
            Destination.Cells(1, Column).Value = RecordSet.Fields(Column - 1).Name
         Next Column
         Destination.Cells(1, 1).Resize(1, RecordSet.Fields.Count).Font.Bold = True
         Set Destination = Destination.Offset(1)
      End If
      Destination.CopyFromRecordset RecordSet
      Application.ScreenUpdating = True
      RecordSet.Close
   ElseIf ReturnArray Then
      ' Return an array
      RecordSet.MoveFirst
      Do While Not RecordSet.EOF
         RecordCount = RecordCount + 1
         RecordSet.MoveNext
      Loop
      ReDim Destination(1 To RecordCount + IIf(WriteHeader, 1, 0), 1 To RecordSet.Fields.Count)
      Row = 1
      If WriteHeader Then
         For Column = 1 To RecordSet.Fields.Count
            Destination(Row, Column) = RecordSet.Fields(Column - 1).Name
         Next Column
         Row = Row + 1
      End If
      RecordSet.MoveFirst
      Do While Not RecordSet.EOF
         For Column = 1 To RecordSet.Fields.Count
            Destination(Row, Column) = RecordSet.Fields(Column - 1).Value
         Next Column
         Row = Row + 1
         RecordSet.MoveNext
      Loop
      RecordSet.Close
   Else
      ' Return recordset
      Set Destination = RecordSet
   End If

End Sub

[End Code Segment]

Kevin
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Expert Comment

by:dlmille
Comment Utility
Of course, a very simple way to purge code from a workbook is to save it as a macro-free workbook.

File SaveAs ExcelWorkbook or Exce 97-2003 Workbook.

Its that simple.  I had never done this before so I took a sample excel file with lots of macros in several modules and sheet codepages, saved as macro free and presto - the job was done.

Dave
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LVL 41

Expert Comment

by:dlmille
Comment Utility
Please ignore my post - was meant for another question...

Dave
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Author Closing Comment

by:tahirih
Comment Utility
Thank you
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