Question

You are a database consultant with Ace Software, Inc., and have been assigned to develop a database for the Mom and Pop Johnson video store in town. Mom and Pop have been keeping their records of videos and DVDs purchased from distributors and rented to customers in stacks of invoices and piles of rental forms for years. They have finally decided to automate their record keeping with a relational database.

You sit down with Mom and Pop to discuss their business, and watch their operation for about a week. You discover quickly that a video and a DVD are both copies of a movie kept in a separate plastic case that is rented out. They have several copies of each movie they rent, therefore there are several videos and DVDs for each movie title. You learn that in their inventory they have several thousand videos and DVDs, which they get wholesale from about a half dozen distributors. The video and DVD prices to them are based on the quantity of their shipment and the past business they have done with each company.

The price of a DVD for a movie might be different than the price of a video for the same movie, even from the same distributor. Each distributor provides different types of movies (e.g., suspense, horror, mystery, comedy, etc.). A single distributor may provide several different types of movies in both video and DVD format. It is possible to obtain the same movie from multiple distributors and at different wholesale prices.

Each video and DVD has a unique identification number that Mom and Pop assign in their inventory, in addition to the distributor's serial number for the item. Each movie also has a unique identification number Mom and Pop assign in addition to the title and any movie IDs the distributors use in their electronic catalogs. Distributors provide electronic catalogs to Mom and Pop, and the information from these catalogs must be included in the database.

Mom and Pop need to record when a video or DVD is rented, when a video or DVD is returned, and all customer charges such as late and damaged fees, failure to rewind fees, and taxes. They need a report of which videos are returned late because there are standard and late charges. On occasion there are discount prices for certain movies or types of movies. Customers want to rent movies based on actors or actresses, running length, type of movie, rating, year released, the director, and the Academy Awards won (by the movie, the actors, the actresses and/or the directors). Customers also want to know how many videos they have rented in the last month, year, and so forth. Mom and Pop need to keep only basic information on customers in their database, such as name, address, telephone numbers, etc.

There must be no limit to the number of video and/or DVD copies of a movie that Mom and Pop can have in their inventory. Video/DVD ID numbers, movie ID numbers, and distributor ID numbers for videos, DVDs, and movies are all different. Also, each movie must be able to have an unlimited number of actors, actresses, directors, and Academy Awards (i.e., Oscars). Other types of awards (e.g., Golden Globe, People's Choice, etc.) are not of interest for this application. The rental of equipment, sale of videos, DVDs, popcorn, etc., is not to be kept in the database.

(A) Using your selected RDBMS develop and execute an SQL script file to:

Show the contents of all tables

Retrieve all of the customers' names, account numbers, and addresses (street and zip code only), sorted by account number

Retrieve all of the DVDs rented in the last 30 days and sort in chronological rental date order

Update a customer name to change their maiden names to married names. You can choose which row to update. Make sure that you use the primary key column in your WHERE clause to affect only a specific row.

Delete a specific customer from the database. You can choose which row to delete. Make sure that you use the primary key column in your WHERE clause to affect only a specific row.

Answer 1

1.Retrieve all of the customers' names, account numbers, and addresses (street and zip code only), sorted by account number.
Create the Customer table as below:

Create table customers (accnt_no number(7) NOT NULL,
   first_name varchar2(20) NOT NULL,
   middle_name varchar2(20),
   last_name varchar2(20) NOT NULL,
   street_address varchar2(40) NOT NULL,
   city varchar2(20) NOT NULL,
   state varchar2(10) NOT NULL,
   zip_code varchar2(10) NOT NULL,
   phone_number number(10) NOT NULL,
   PRIMARY KEY (accnt_no);
select accnt_no, first_name, middle_name, last_name, street_address, zip_code from customers order by 1;
2.Retrieve all of the DVDs rented in the last 30 days and sort in chronological rental date order
Create table rental_details
CREATE TABLE rental_details
(
   id number(10) NOT NULL,
   customer_id number(5) NOT NULL,
   inventory_id number(10) NOT NULL,
   rental_date date NOT NULL,
   return_due_date date NOT NULL,
   is_rented varchar2(1) NOT NULL,
   is_returned varchar2(1) NOT NULL,
   total_charge number(19,4) NOT NULL,
   tax number(19,4) NOT NULL,
   PRIMARY KEY (id)
);
select * from rental_details where rental_date >= (sysdate-30) order by rental_date;

3.Update a customer name to change their maiden names to married names. You can choose which row to update. Make sure that you use the primary key column in your WHERE clause to affect only a specific row.
Ex:A record with last name John has to be updated to Williams and her AccountNum is 12345  
update customers set last_name = 'Williams' where accnt_no = 12345;

4.Delete a specific customer from the database. You can choose which row to delete. Make sure that you use the primary key column in your WHERE clause to affect only a specific row
delete from customers where accnt_no = 12345;