SELECT Trim(System_MA.Name & ", " & System_MA.Vorname) AS Mitarbeitername, Sum(dauerabrechnung*stundensatz*zuschlagfaktor) AS Netto
FROM U_Std_Typen INNER JOIN (System_MA INNER JOIN StdArchiv ON System_MA.id = StdArchiv.Mitarbeiter) ON U_Std_Typen.id = StdArchiv.Typ