AIS4 - Chapter 3 Data Modeling Review Economic Reality...

Info icon This preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3 Data Modeling
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Review 1/20/2016 2 Economic Reality Model Database
Image of page 2
REA Ontology Models Levels of the REA Ontology Value System Value Chain Level Business Process Level Task Level Business Processes Financing Human Resources (HR) Acquisition Production Revenue
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Structure Models Describe the data and information structures inherent in a business process. Create a blueprint for the development of a relational database to support the collection, aggregation, and communication of process information. Facilitate the use of databases after they are implemented. 3-4
Image of page 4
Structure Models - Purposes Describe the entities or things in the domain of interest Describe the relationships among those things Specify how many instances of one entity can be related to another Identify the attributes or characteristics of the entities and relationships 3-5
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Unified Modeling Language (UML) UML class diagram notation for structure models Specifications for UML maintained by the Object Management Group, a not-for-profit consortium of computer industry members Class diagrams describe the logical structure of a database system 3-6
Image of page 6
UML Class Diagram Building Blocks Four Basic Constructs: Class Attribute Association Multiplicity (Cardinality) 3-7
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
UML Class Diagram - Classes Group of named objects that exist Classes can represent organization resources (e.g., trucks, machines, buildings, cash, investments) events (e.g., sales, purchases, cash disbursements, cash receipts), and conceptual structures (e.g., accounts, product categories, budgets) persons (e.g., customers, employees) Generally represent our R-E-and-As 3-8
Image of page 8
UML Class Diagram Classes
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Attribute Characteristics or elementary properties of classes. They are used for actual communication about real world phenomena represented by objects Example attributes for the class CUSTOMER: Customer #, name, address, phone number, credit limit A primary key (PK) is a special attribute used to represent an instance of an object in a database Must be unique and universal . Can be a concatenated (combined) key. A foreign key (posted key) is a special attribute used to link to another class. It’s supports the links between classes shown in the associations 10
Image of page 10
Attribute designation for classes Primary key has a PK next to it. We will generally omit multivalued attributes, derived attributes, and methods. I generally exclude foreign keys, but the text includes them with FK next to them. 11 << stereotype >> ClassName keyAttribute (PK) Attribute multivaluedAttributes [0..*] /derivedAttributes foreignKeyAttribute (FK) opreration()
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Attribute Symbol Name in second box (PK for Primary key) 12 <<External Agent>> Customer Customer# (PK) name address phoneNumber creditLimit
Image of page 12
Primary Keys Should you use Hong Kong ID numbers as primary keys?
Image of page 13

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern