I have created and insert queries :

Table 1: Employee

Employee_name	Street	City
William Gates III	University St	Redmond
Warren Buffett	Alaskan Way	Omaha

Table 2: Works

Employee_name	Company_name	Salary
William Gates III	Microsoft	1400000
Warren Buffett	Exxon Mobil	230000

Table 3: Company

Company_name	City
Microsoft	Redmond
Exxon Mobil	Omaha

Table 4: Manages

Employee_name	Manager_name
Paul Allen	William Gates III
Carlos Slim Helu	Lakshmi Mittal

I have created and insert queries :

Questions:

1- Find the names of all employees who do not work for either Microsoft or Facebook.

2- Find cities of residence of all employees who earn either strictly less than $50,000 or strictly more

than $400,000.

3- Find the company name and their number of employees. Display the results in descending order or

the number of employees. If two companies have the same number of employees, display them in

lexicographical order.

4- Find the name of managers that have their salary smaller than some of the employee they manage.

thank you..