What are the emails of employees with null commission, salary between 7000 and 12000, and who work in department 50?
SELECT email FROM employees WHERE commission_pct  =  "null" AND salary BETWEEN 7000 AND 12000 AND department_id = 50
SELECT email FROM employees WHERE commission_pct  =  "null" AND salary BETWEEN 7000 AND 12000 AND department_id = 50
[{'Nenhum': 'Nenhum resultado encontrado'}]