QUESTION 4 Consider the following relational schema for an Online book store database: Product (BookID, Bookname, UnitPrice, Author_ID) Customer_order(Order_ID,CustomerID,Quantity_Ordered,Order_Date) Author(Author_ID, Author_name, Author_description) The primary keys are underlined. Write SQL queries to answer the following: (a) Create Customer, Customer and Order tables from the relational schema described above. Select appropriate data types for each attribute. Remember to set the primary and foreign keys. (9 marks) (b) List the Customers Orders if the book quantity is more than 5 copies. (3 marks) (c) List the book ID and Book name for all books and sort the books by the Authors name alphabetically. (9 marks) (c) Write the statement to update the unit prices of all books by 50 cent.