'Associative entity' presentation slideshows

1.44k views • 123 slides

More on ER Model Detail Relationships

More on ER Model Detail Relationships. 4. Detail Conceptual Data Model. Attributes. Attribute A property or characteristic of an entity type that is of interest to the organisation Simple Attribute An attribute that cannot be broken down into smaller components e.g. Emp No. Emp No.

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Chapter 3: Modeling Data in the Organization

Chapter 3: Modeling Data in the Organization. Business Rules. Statements that define or constrain some aspect of the business Assert business structure Control/influence business behavior Expressed in terms familiar to end users Automated through DBMS software. Scope of Business Rules.

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Chapter 2 Modeling Data in the Organization

Chapter 2 Modeling Data in the Organization. Jason C. H. Chen, Ph.D. Professor of MIS School of Business Administration Gonzaga University Spokane, WA 99258 chen@gonzaga.edu. EMPLOYEE. derived/ computed. composite. multi-valued. Questions:

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IS 4420 Database Fundamentals Chapter 3: Modeling Data in the Organization Leon Chen

IS 4420 Database Fundamentals Chapter 3: Modeling Data in the Organization Leon Chen. Systems Development Life Cycle. Database Development Process. Enterprise modeling. Project Identification and Selection. Conceptual data modeling. Project Initiation and Planning. Analysis.

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MIS 385/MBA 664 Systems Implementation with DBMS/ Database Management

MIS 385/MBA 664 Systems Implementation with DBMS/ Database Management. Dave Salisbury salisbury@udayton.edu (email) http://www.davesalisbury.com/ (web site). Modeling reality. A database must mirror the real world if it is to answer questions about the real world

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Chapter 3: Modeling Data in the Organization

Chapter 3: Modeling Data in the Organization. ? : ? 11 ?? Chapter 2. ????? ???????. Business Rules. Statements that define or constrain some aspect of the business ??????? : Ex. ????????????? 30 ?? Control/influence business behavior ??????? Ex. ????????

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May 8

May 8. More on Data Modeling. Types of Entities. Fundamental Entity regular rectangle (exist by themselves) Attributive Entity only exists because of the existence of some other entity Associative Entity result from many to many relationship. John Ahmed Mary Ngan Steve. CS211

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Modeling Data in the Organization

Modeling Data in the Organization. The E-R Model.

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Overview of Entity?Relationship Model

Entity?Relationship Model is a detailed, logical representation of the data for an organization or for a business area. What are the entities and relationships in the enterprise?

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Major Topics

Major Topics. Databases Normalization Data warehouses Data mining. Objectives for Data Storage Design. The data must be available when the user wants to use it The data must have integrity It must be accurate and consistent

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IT354 Database Design

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Mapping ER modeling to Relationships

Mapping ER modeling to Relationships. Review of Relation Properties. Relation Every relation has a unique name. Every attribute value is atomic. Every row is unique. Attributes in tables have unique names. The order of the columns is irrelevant. The order of the rows is irrelevant.

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Unary Relationships

Unary Relationships. On the Job. Is this a legitimate design? Do you see problems with it?. The Family. Is this a legitimate design? Do you see problems with it?. Complicated Relationships Among People*. Workers have supervisors, who also have supervisors

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Characteristics of Things

Characteristics of Things. Relationship Naturally occurring association among specific things Occur in two directions Number of associations is cardinality or multiplicity Binary, unary, ternary, n-ary Attribute One specific piece of information about a thing.

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Database Fundamentals

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Exercises

Exercises. 1. In a course registration system, for the event student registers for classes , create an event table entry listing the event, trigger, source, activity, response(s), and destination(s). For the event time to produce grade reports , create another event table entry.

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Associative entity

Kk ilo. Associative entity. Associative entity. Associative entity : an entity type that associates the instance of one or more entity types and constants attributes that are peculiar to the relationship between those entity instances. Rules for make associative entity.

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ERD Narrative (p158 Lab Manual)

ERD Narrative (p158 Lab Manual). Oakfield Orthopaedic Hospital.

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E-R model for Exercise #1

name. DOB. Coach. Ranking. height. Is assigned. PLAYER. TEAM. name. rating. Is assigned to. Phone #. address. E-R model for Exercise #1. Comments:

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