Not displaying another column

Dim connection As OleDbConnection
       Dim adapter As OleDbDataAdapter
       Dim ds As New DataSet
       Dim SQLStr As String
       Dim cmd As OleDbCommand
       connection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=consignacion.mdb;")
       SQLStr = "SELECT sum(total) FROM salesdb WHERE buydate=@buydate GROUP BY buyer"
       cmd = New OleDbCommand(SQLStr, connection)
       cmd.Parameters.AddWithValue("@buydate", Form1.Lbldate2.Text)

       Try
           connection.Open()
           adapter = New OleDbDataAdapter(cmd)
           adapter.Fill(ds)
           connection.Close()
           DataGridView1.DataSource = ds.Tables(0)
       Catch ex As Exception
           MsgBox(ex.ToString)
       End Try

Quote:

>data<
Buyer total
GIAN 100.00
BANAL 5,000.00
BANAL 2,200.00
JUN CASH 12,321.00

>output<

buyer total newcolumnautoadded
100.00
7,200.00
12,321.00

wanted output
GIAN 100.00
BANAL 7,200.00
JUN CASH< 12,321.00


just made it work via searching and learning please help me here.
i want to display the names too.