For this assignment, we will be using the following relational schema for our qu

Question

For this assignment, we will be using the following relational schema for our queries.
Customer(CID, Name, Address)
Orders(Ordernum, CID, Order_date, Cardnum)
Orderlist(Ordernum, ISBN, Qty, Ship_date)
Book(ISBN, Title, Author, Qty_in_stock, Price)
When an order is placed, there is one entry added to Orders which contains the customer information and order details. Then there is one entry per book entered into Orderlist with "NULL" in the ship date which will be replaced once that line item has been shipped. Each book item will only be shipped when all the copies are present (ie: we have sufficient Qty_in_stock for the Qty of the order, that way there is a unique ship_date for each line item). Note: you can also take advantage of renaming (RA) and views (SQL) to break down some of the queries into smaller parts.

SQL Queries
9. Write a SQL QUERY which will list the CID and name of all the customers who have ordered every book written by ‘C.S. Lewis’ which we have in the catalogue.

If you write a Relational Algebra Query, I will downvote.

Thank you.

Explanation / Answer

9. Write a SQL QUERY which will list the CID and name of all the customers who have ordered every book written by ‘C.S. Lewis’ which we have in the catalogue.

SELECT CID, NAME FROM CUSTOMER JOIN ORDERS ON CUSTOMER.CID = ORDERS.CID

JOIN ORDERLIST ON ORDERLIST.Ordernum = ORDERS.Ordernum

JOIN BOOK ON BOOK.ISBN = ORDERLIST.ISBN

WHERE BOOK.Author = 'C.S. Lewis';

Please let me know in case of any clarifications required. Thanks!

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