need help

Use sub queries to answer the following 01) write a query to display the employees first name and department id for all employees who work in sales department. 1 pts I 02) write a query to find the employee who earns a salary greater than the average salaries for department 50.1 pts 03) display the department names and ids that is located in the country United States of America". 1pts 04) display the names and salaries of employees who get a salary greater than the average between max salary and min salary for his job. 2pts