that makes no sense...
I would expect something like:
select staff.initials
from staff
left join ldg_tran
   on ldg_tran.billing_md_id = staff.staff_id
where ldg_tran.proc_dttm between '4/5/2013' and '4/12/2013'


the original post was missing the definition for ldg_tran in the from clause...unless that is how CR formats its sql.

at least that is what I would enter into query analyzer to get a response back from sql server.

HTH