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A Guide to SQL, Sixth Edition
Chapter 1Introduction to Premiere Products and
Henry Books
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Objectives
Introduce Premiere Products, a company whose database is used as the basis for many of the examples throughout the text
Introduce Henry Books, a company whose database is used in the case that runs throughout the text
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The Premiere Products Database
Premiere Products is a distributor of appliances, housewares, and sporting goods
It is no longer feasible to maintain customer, order, and inventory data using its current manual system
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Benefits of a Computer Database System
Ensure that the data is current and more accurate than in the present manual system
Produce a variety of useful reports
Ask questions concerning the database and obtain answers easily and quickly
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Required Data for Sales Reps
Number
Last name
First name
Address
Total commission
Commission rate of each sales rep
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Required Data for Customers
Customer number
Last name
First name
Address
Current balance
Credit limit
The number of the sales rep who represents the customer
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Required Data for Parts
Part number
Part description
Number of units on hand
Item class
Number of the warehouse where the item is stored
Unit price for each part in the inventory
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Sample Order
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Components of Sample Order
Heading (top of the order) contains: Order number and dateCustomer’s number, name, and addressSales rep number and name
Body of the order contains a number of order lines called line items
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Components of Sample Order
Each order line contains: Part numberPart descriptionNumber of units orderedQuoted priceTotal, called ‘extension’
Footing (bottom of the order) contains the order total
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Item Information Stored for Each Order
Order number, date the order was placed, and the customer number of the customer who placed the order
Order number, part number, number of units ordered, and quoted price for each order line
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Overall Order Total
Overall order total is not stored as part of the database
Total order will be computed whenever an order is printed or displayed on the screen
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Sample Data for Premiere Products
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Sample Data for Premiere Products
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Sample Data for Premiere Products
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Sample Data for Premiere Products
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Sample Data for Premiere Products
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Sales Rep Information
Three sales representatives identified by numbers Example:Sales Rep Number: 20Name: Valerie KaiserAddress: 624 Randall, Grove, FL 33321Total commission: $20,542.50Commission rate: 5% (.05)
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Customer Information
Premiere Products has 10 customers who are identified with the numbers 148, 282, 356, 408, 462, 524, 608, 687, 725, and 842Example: Customer Number: 148 Name: Al’s Appliance and Sport Address: 2837 Greenway in Fillmore, FL 33336 Current Balance: $6,550.00 Credit Limit: $7,500.00 Sales Rep: 20
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Part Information
There are 10 parts identified by part numbers AT94, BV06, CD52, DL71, DR93, DW11, FD21, KL62, KT03, and KV29
Item class codes are HW (housewares), AP (appliances), and SG (sporting goods)
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Part Data Example
Example:Part Number: AT94Part Description: IronUnits on Hand: 50Item Class: HW (housewares)Warehouse Number: 3Unit Price: $24.95
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Order Information
Seven orders identified with the numbers 21608, 21610, 21613, 21614, 21617, 21619, and 21623Example:Order number: 21608Order date: October 20, 2003Customer number: 148 (Al’s Appliance and
Sport)
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Alternative ORDERS Table Structure
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Problem with Alternative ORDERS Table
Some of the individual positions within the table contain multiple entries
Multiple entries make it difficult to track the information between columns
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Practical Issues Raised by a Complex Table
How much room do you allow for these multiple entries?
What if an order has more order lines than you have allowed for?
Given a part, how do you determine which orders contain order lines for that part?
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ORDER_LINE Table Advantages
No multiple entries
Does not matter how many order lines exist for any order
Finding all the orders that contain order lines for a given part is easy
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Henry Books Database
Ray Henry is the owner of a bookstore chain named Henry Books
Ray has decided to store his data in a database because he wants to: Ensure that the data is current and accurate Produce several important reports Ask questions concerning the data and obtain
answers to these questions easily and quickly
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Information Gathered by Henry Books
Henry gathers and organizes information about: BranchesPublishersAuthorsBooks
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Types of Information
Each branch has a number that uniquely identifies the branch
In addition, Ray tracks the branch’s:NameLocationNumber of employees
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Types of Information
Each publisher has a code that uniquely identifies the publisher
In addition, Ray tracks the publisher’s:NameCity
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Types of Information
Each author has a number that uniquely identifies the author
In addition, Ray records each author’s:Last name First name
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Types of Information
Each book has a code that uniquely identifies the bookFor each book, Ray also tracks: TitlePublisherType of bookPriceWhether the book is a paperback or not
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Summary
Premiere Products is an organization whose information requirements include the following:Sales representativesCustomersOrdersPartsOrder lines
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Summary
The database for Henry Books contains the following information:BranchesPublishersBooksAuthors InventoryAuthor Sequence
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SQL Project One Completed
Good Luck
H. Zamanzadeh
