SQL -- relationship to the tech_group a JOB_Ticket belongs to

when looking at the ticket in the front end I see  Values in the detail pain

where/ how is this value held, do I have to Navigate the problem types

I am using the  below sql at the moment but does not always work correctly.

select tg.NAME as TechGroupName from from job_ticket jt

       inner  join status_type  st on

       jt.STATUS_TYPE_ID  = st.STATUS_TYPE_ID

       inner join whd.tech wt on

       jt.ORIGINAL_TECH_ID = wt.client_id

       inner join tech_group tg on

        wt.Supervisor_ID = tg.MANAGER_ID