The CData Cmdlets PowerShell Module for Bullhorn 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 c.CandidateName, o.Certification, o.GraduationDate, o.Comments FROM Candidate c INNER JOIN CandidateEducation o ON c.Id = o.CandidateId

Left Join

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

 SELECT c.Subject, o.AttendeeId FROM Appointment c LEFT JOIN AppointmentAttendee o ON c.Id = o.AppointmentId