Question

Marcia Wilson owns and operates Marcia’s Dry Cleaning, which is an upscale dry cleaner in a well-to-do suburban neighborhood. Marcia makes her business stand out from the competition by providing superior customer service. She wants to keep track of each of her customers and their orders. Ultimately, she wants to notify them that their clothes are ready via e-mail. Suppose that you have designed a database for Marcia’s Dry Cleaning that has the following tables:CUSTOMER (CustomerID, FirstName, LastName, Phone, Email,)INVOICE (InvoiceNumber, CustomerID, DateIn, DateOut, Subtotal, Tax, TotalAmount)INVOICE_ITEM (InvoiceNumber, ItemNumber, ServiceID, Quantity, UnitPrice, ExtendedPrice)SERVICE (ServiceID, ServiceDescription, UnitPrice)Assume that all relationships have been defined, as implied by the foreign keys in this table list, and that the appropriate referential integrity constraints are in place.Create a dependency graph that shows dependencies among these tables. Explain how you need to extend this graph for views and other database constructs such as triggers and stored procedures.Assume you want to change the name of the INVOICE table to CUST_INVOICE. Use the following steps to change the table name:(1) Create a new table with the new name.(2) Alter any constraints, triggers, or views that may be affected.(3) Copy all data from the old table to the new table.(4) Create any needed foreign key constraints(5) Drop the old table

Answer 1

Answer:

Marcia Wilson owns and operates Marcia’s Dry Cleaning, which is an upscale dry cleaner in a well-to-do suburban neighborhood. Marcia makes her business stand out from the competition by providing superior customer service. She wants to keep track of each of her customers and their orders. Ultimately, she wants to notify them that their clothes are ready via e-mail. Suppose that you have designed a database for Marcia’s Dry Cleaning that has the following tables:

Assume that all relationships have been defined, as implied by the foreign keys in this table list, and that the appropriate referential integrity constraints are in place.

Create a dependency graph that shows dependencies among these tables. Explain how you need to extend this graph for views and other database constructs such as triggers and stored procedures.

Assume you want to change the name of the INVOICE table to CUST_INVOICE. Use the following steps to change the table name:

(1) Create a new table with the new name.

(2) Alter any constraints, triggers, or views that may be affected.

(3) Copy all data from the old table to the new table.

(4) Create any needed foreign key constraints

(5) Drop the old table.

Explanation: