query: SELECT department_id ,  AVG(salary) FROM employees WHERE commission_pct != "null" GROUP BY department_id
question: What is the average salary of employees who have a commission percentage that ain't null?
query_toks: SELECT department_id , AVG ( salary ) FROM employees WHERE commission_pct ! = `` null '' GROUP BY department_id
query_toks_no_value: select department_id , avg ( salary ) from employees where commission_pct ! = value group by department_id
question_toks: What is the average salary of employees who have a commission percentage that ain't null?