Hallo Odium,
Versuch mal dies:
select tblGeraete.Geraete_ID, MAX(tblGeraete.Seriennummer),
MAX(tblGeraete.Verwaltungsbez1), MAX(tblGeraete.MAC, tblGerKlasse.Beschreibung),
MAX(tblGerTyp.Beschreibung), MAX(tblHistorie.Ausg_am), MAX(tblGeraete.GerKlasse_ID),
count(tblHistorie.Geraete_ID)
from tblGeraete, tblGerKlasse, tblGerTyp, tblHistorie
WHERE tblGeraete.GerKlasse_ID = tblGerKlasse.GerKlasse_ID AND tblGeraete.GerTyp_ID = tblGerTyp.GerTyp_ID
AND tblGeraete.Geraete_ID = tblHistorie.Geraete_ID
GROUP BY tblGeraete.Geraete_ID
ORDER BY tblGeraete.GerKlasse_ID, tblGeraete.Verwaltungsbez1, tblGeraete.Geraete_ID
Gruß Frank