For the bookstore database, write expressions of relational algebra to answer the following queries:

1.) List customers (cno, name) the zip of whose address is 49008.

2.) List customers (cno, name) who live in Michigan.

3.) List employees (name) who have customers in Michigan.

4.)List employees (name) who have both 49008-zipcode customers and 49009-zipcode customers.

itabase 3: Assume a book store has a mail-order database with the following schema of relations: (Primary keys are derlined. Meaning of each attribute is self-explanatory by its name.) Employees (ENO, Ename, Hire_Date); Books (ISBN, Bname, Quantity, Price); Customers (CNO, Cname, Street, Zip, Phone); Orders (ONO, CNO, ENO, Received, Shipped); Orderline (ONO, ISBN, Qty); Zipcodes (Zip, City, State)