Sub test()
Application.DisplayAlerts = False
On Error Resume Next
Sheets("prospects2").Delete
On Error GoTo 0
Application.DisplayAlerts = True
With Sheets.Add(After:=Sheets(Sheets.Count))
.Name = "prospects2"
End With
Sheets("prospects").Rows(1).Copy Sheets("prospects2").Rows(1)
Dim Cn As String, SQL As String
Cn = GenereCSTRING(Xls, Base:=ThisWorkbook.FullName, Titre:=True)
SQL = "insert into [prospects2$] Select frm.* from [prospects$] as frm left join [test$] as frm2 on frm2.[SOCIÉTÉ CLIENT]=frm.[nom] where frm2.[SOCIÉTÉ CLIENT]is null"
ExecuteRequete SQL, Cn
End Sub