Hi,
Please try this query and let us know.
SELECT TOP 10 F.Application.Name, F.Port, AVG(F.TotalPackets) as Average, MAX(F.TotalPackets) as Peak
FROM Orion.NetFlow.flows F
WHERE F.IngressInterface.InterfaceID in (295, 294) AND minutediff(F.ObservationTimestamp, GetDate()) < 15 AND F.PORT <> 0
GROUP BY F.Application.Name, F.Port
ORDER BY Average DESC