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Source: ActivityHistory
The ActivityHistory object is a read-only object that shows all completed Tasks and past Events related to a give object (e.g. Account). It includes activities for all contacts related to the object.
This object is shown in the Activity History related list:
Few limitations apply:
- The object cannot be queried directly but only queried through inner query (e.g. Select Id, (Select Subject From ActivityHistory) From Account Where Name = ‘ACME bros’)
- Your main query must reference exactly 1 record
- Inner query must not have a WHERE clause
- Inner query must filter a maximum of 500 items
Here is an example query: