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

1.) List customers (name) who've ordered books through an employee named 'Jones'.

2.)List customers (name) who've NOT ordered the book "Database".

3.)All possible pairs of books (Bname). (A pair should be listed only once).

4.)All possible pairs of books (Bname) where the first has a price of 24.99 and the second has a price of 19.99.

ANSWER ALL PLS

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)