See Create Export to CSV using SQL Query for information on using query below for export to csv.

Note: Access level names in export query need to be updated to match names in options -> Setup -> Staff -> Access tab,

 

select SM."Id", CM."First_Name", CM."Last_Name"

, case when SM."Access" = 0 then 'Owner'

      when SM."Access" = 1 then 'Owner'

       when SM."Access" = 2 then 'Desk'

       when SM."Access" = 3 then 'AccessC' //update name of access level here

       when SM."Access" = 4 then 'AccessD' //update name of access level here

       when SM."Access" = 5 then 'AccessE' //update name of access level here

       else '' end "Access Level"

from "Staff_Main" SM

join "Client_Main" CM on CM."Ref_Number" = SM."Cln_Link"

where SM."Status" = 'A'

and SM."Id" <> 'OWN'