Question 9. Write a SQL query to find all products with a price greater than or equal to the average product price. Question 10. Write a SQL query to display the number of products in each category that have a water base, sorted by category. Question 11. Write a query to display the employee number, last name and first name, and sum of invoice totals for all employees who completed an invoice. Sort the output by employee last name and then by first name. Question 12. Write a SQL query to display the largest average product prize of any brand. Question 13. Write a SQL command to change the department number to 300 for the employee whose employee number is 83537. Question 14. Write a SQL command to alter the employee table to include EMP_HRS attribute. The attribute should not accept NULL values, and it should have default value 10. Question 15. Write a SQL command to modify the brand 23 to indicate the brand type Premium