The CData SSIS Components for Act! CRM supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

 SELECT t.Subject, t.Details, p.CompaniesAggregate, p.StartTime FROM Activities t Inner JOIN ContactActivities p ON t.Id = p.ContactId

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

 SELECT t.Subject, t.Details, p.CompaniesAggregate, p.StartTime FROM Activities t LEFT JOIN ContactActivities p ON t.Id = p.ContactId