Table schema:
CREATE TABLE employees (department_id VARCHAR, salary VARCHAR, commission_pct VARCHAR)

Question: display all the information of employees whose salary is in the range of 8000 and 12000 and commission is not null or department number does not equal to 40.
SQL: SELECT * FROM employees WHERE salary BETWEEN 8000 AND 12000 AND commission_pct <> "null" OR department_id <> 40