query: SELECT T1.staff_name ,  T1.staff_gender FROM staff AS T1 JOIN Staff_Department_Assignments AS T2 ON T1.staff_id  =  T2.staff_id WHERE T2.job_title_code  =  "Sales Person" EXCEPT SELECT T1.staff_name ,  T1.staff_gender FROM staff AS T1 JOIN Staff_Department_Assignments AS T2 ON T1.staff_id  =  T2.staff_id WHERE T2.job_title_code  =  "Clerical Staff"
question: Finding a a name and a gender a a staff which have be assigned a a job Sales Person but never Clerical Staff.
query_toks: SELECT T1.staff_name , T1.staff_gender FROM staff AS T1 JOIN Staff_Department_Assignments AS T2 ON T1.staff_id = T2.staff_id WHERE T2.job_title_code = `` Sales Person '' EXCEPT SELECT T1.staff_name , T1.staff_gender FROM staff AS T1 JOIN Staff_Department_Assignments AS T2 ON T1.staff_id = T2.staff_id WHERE T2.job_title_code = `` Clerical Staff ''
query_toks_no_value: select t1 . staff_name , t1 . staff_gender from staff as t1 join staff_department_assignments as t2 on t1 . staff_id = t2 . staff_id where t2 . job_title_code = value except select t1 . staff_name , t1 . staff_gender from staff as t1 join staff_department_assignments as t2 on t1 . staff_id = t2 . staff_id where t2 . job_title_code = value
question_toks: Finding a a name and a gender a a staff which have be assigned a a job Sales Person but never Clerical Staff.