Uśrednianie listy TIMESTAMP(6) WITH TIME STREFA razy

Użyj AVG funkcja

SELECT avg(cast(lastprocesseddate as date)-cast(importeddate as date))
FROM feedqueueitems 
WHERE eventid = 2213283 
ORDER BY written DESC;

W bazie danych ze strefą czasową +1 dla importowanej daty i ostatniej przetworzonej daty to UTC

SELECT avg(cast(cast(lastprocesseddate as timestamp with time zone) at time zone '+01:00' as date)-cast(importeddate as date))
FROM feedqueueitems 
WHERE eventid = 2213283 
ORDER BY written DESC;