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Project Scenario: You are a small consulting company specializing in database development.
You are a small consulting company specializing in database development. You have just been
awarded the contract to develop a data model for a database application system for a small retail
store called Oracle Baseball League (OBL).
The Oracle Baseball League store serves the entire surrounding community selling baseball kit. The
OBL has two types of customer, there are individuals who purchase items like balls, cleats, gloves,
shirts, screen printed t-shirts, and shorts. Additionally customers can represent a team when they
purchase uniforms and equipment on behalf of the team.
Teams and individual customers are free to purchase any item from the inventory list, but teams get
a discount on the list price depending on the number of players. When a customer places an order
we record the order items for that order in our database.
OBL has a team of three sales representatives that officially only call on teams but have been known
to handle individual customer complaints.
Section 2 Lesson 4 Exercise 2: Unique Identifiers
Identifying Artificial Unique Identifiers (UIDs) (S2L4 Objective 2)
Using the Barker notation softboxes created previously identify and assign the unique identifiers that
will be used to uniquely identify the given entities.
• If no information bearing identifier has been assigned then assign an artificial one.
Normally we use id or number as the name for the artificial identifier.
• If an information bearing identifier has been identified then you need to choose if you
will use that as the primary unique identifier or as a secondary one. If you are going to
use it as a secondary identifier then create an artificial identifier and enclose the
information bearing identifier # sign in brackets.
Potential Entities and Attributes