query: SELECT role_code FROM Project_Staff GROUP BY role_code ORDER BY count(*) DESC LIMIT 1
question: What-what that most common role for that staffs?
query_toks: SELECT role_code FROM Project_Staff GROUP BY role_code ORDER BY count ( * ) DESC LIMIT 1
query_toks_no_value: select role_code from project_staff group by role_code order by count ( * ) desc limit value
question_toks: What-what that most common role for that staffs?