Report showing Opportunities that have no associated Tasks
For context, our structure for this work type is:
Incident joined to Opportunity
The Opportunity then may or may not have a task. If there *is* a task, then they would all have the same "Task Name".
It's probably obvious (my head is mashed!) - but I'm trying to run a report that shows all Opportunities with no associated task.
Could someone please explain how to do this? What filters should I use? What table joins?