query: SELECT email FROM employees WHERE commission_pct  =  "null" AND salary BETWEEN 7000 AND 12000 AND department_id = 50
question: displaying a email them a employee them at has no commissions percentage and salary a range 7000 12000 and so work 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: displaying a email them a employee them at has no commissions percentage and salary a range 7000 12000 and so work that there department which number 50.