Why am I getting a system error with this Query Activity in Automation Studio?
Select
o.AccountID
, o.JobID
, o.SubscriberKey
, o.EventDate
, o.isUnique
, o.Domain
, o.SubscriberID
, o.OYBAccountID
, o.ListID
, o.BatchID,
s.TriggererSendDefinitionObjectID
from _Open as o
where DATEDIFF(hour, o.EventDate, GETDATE()) <= 0