คำสั่ง SQL ที่ตัดข้อมูลที่เราไม่สนใจออก เป็นคำสั่งยังไงค่ะ

Imports System.Data.Odbc
Imports System.Data

Public Class Form2
    Dim conn As OdbcConnection
    Dim strcon As String
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim conn As OdbcConnection = New OdbcConnection()
        Dim da As OdbcDataAdapter
        Dim ds As DataSet = New DataSet
        Dim strcon As String = "DRIVER={Microsoft Excel Driver (*.xls)}; IMEX=1; HDR=NO;Excel 8.0;ReadOnly=0; DBQ=D:\\nicha\\Model.xls"
        conn = New OdbcConnection(strcon)
        conn.Open()
        Dim strSQL As String
        strSQL = "SELECT [Sheet2$].Customer,Group,[Sheet2$].Assembly,sum(M1),sum(M2),sum(M3) FROM [Sheet1$],[Sheet2$] where [Sheet2$].Assembly = [Sheet1$].Assembly Group by [Sheet2$].Customer,Group,[Sheet2$].Assembly "
        da = New OdbcDataAdapter(strSQL, conn)
        da.Fill(ds)
        DataGridView1.DataSource = ds.Tables(0)
        conn.Close()
        da = New OdbcDataAdapter(strSQL, conn)
        da.Fill(ds)
    End Sub
End Class