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How to differentiate activity history record type?
I want to create an SOQL query returning all Contacts that have ActivityHistory. If I do this:
SELECT Id, Name, (SELECT CallType,ActivityDate,Subject FROM ActivityHistories) FROM Contact
...then I get ALL Contacts regardless of whether they have ActivityHistories or not.
So then I tried:
SELECT Id, Name,
(SELECT CallType,ActivityDate,Subject
FROM ActivityHistories where ActivityDate != null and Id != null) FROM Contact
...and STILL I get back Contacts without ActivityHistories. Does anyone know how to formulate
a query that returns all Contacts and only Contacts which have ActivityHistories?