query: SELECT email FROM employees WHERE commission_pct  =  "null" AND salary BETWEEN 7000 AND 12000 AND department_id = 50
question: display the emails of the employees have no commissions percentage and salary within that range 7000 to 12000 and work in that there department which number 50.
query_toks: SELECT email FROM employees WHERE commission_pct = `` null '' AND salary BETWEEN 7000 AND 12000 AND department_id = 50
query_toks_no_value: select email from employees where commission_pct = value and salary between value and value and department_id = value
question_toks: display the emails of the employees have no commissions percentage and salary within that range 7000 to 12000 and work in that there department which number 50.