Power Query: SQL-server query based on an Excel table

My first trial to query a SQL-database via an Excel list:

let
    Source1 = Excel.CurrentWorkbook(){[Name="Table8"]}[Content],
    Source2 = Sql.Database("MS10\SQLEXPRESS", "TSQL2012"),
    Sales_CustOrders = Source2{[Schema="Sales",Item="CustOrders"]}[Data],
    Joined = Table.Join(Source1, "custid", Sales_CustOrders, "custid"),
in
    Joined


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