Chapter 3 Data Modeling Fundamentals of Database Management Systems by

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Presentation transcript:

Chapter 3 Data Modeling Fundamentals of Database Management Systems by Mark L. Gillenson, Ph.D. University of Memphis Presentation by: Amita Goyal Chin, Ph.D. Virginia Commonwealth University John Wiley & Sons, Inc.

Chapter Objectives Explain the concept and practical use of data modeling. Recognize which relationships in the business environment are unary, binary, and ternary relationships. Describe one-to-one, one-to-many, and many-to-many unary, binary, and ternary relationships.

Chapter Objectives Recognize and describe intersection data. Model data in business environments by drawing entity-relationship diagrams that involve unary, binary, and ternary relationships.

Essence of Data Modeling Exploring the different ways that entities can relate to each other as they always do in the real world Devising a way of recording, of diagramming, the entities and the ways in which they interrelate in the business environment

Entity-Relationship (E-R) Model A diagramming technique Diagrams entities (with attributes) and the relationship between the entities. There are many variations of E-R diagrams in use.

E-R Model Entity (and its attributes) Rectangular shape Salesperson = a type of entity Name of entity is in caps above the separator line.

E-R Model Entity (and its attributes) Entity type’s attributes are shown below the separator line. An asterisk denotes attribute(s) that constitute the entity type’s unique identifier.

Relationships Associations between entities Different kinds: Binary relationships Unary relationships Ternary relationships

Binary Relationships Simplest kind of relationship Relationship between two entity types Diamond-shaped box represents relationship A salesperson “sells” products or products are sold by salespersons

Cardinality Represents the maximum number of entities that can be involved in a particular relationship. One-to-One Binary Relationship One-to-Many Binary Relationship Many-to-Many Binary Relationship

One-to-One Binary Relationship 1-1 A single occurrence of one entity type can be associated with a single occurrence of the other entity type and vice versa.

One-to-Many Binary Relationship Use “crow’s foot” to represent the multiple association. “many” = the maximum number of occurrences that can be involved, means a number that can be 1, 2, 3, ... n.

Many-to-Many Binary Relationship M-M “many” can be either an exact number or have a known maximum.

Cardinality

Modality The minimum number of entity occurrences that can be involved in a relationship. “inner” symbol on E-R diagram (“outer” symbol is cardinality)

Cardinality & Modality

Intersection Data Describes the relationship between two entities. Used with many-to-many relationships. Represented on E-R diagram in a special five-sided intersection data box, which is attached to the relationship diamond between the two entity boxes.

Many-to-Many Binary Relationship with Intersection Data For example, we know not only that salesperson 137 sold some of product 24013 but also how many units of that product that salesperson sold.

Associative Entity Entities can have attributes; many-to-many relationships can have attributes. Many-to-many relationship may be treated similarly to entities in an E-R diagram.

Associative Entity Should you diagram as associative entity or many-to-many relationship? personal taste follow company standards The unique identifier of the associative entity is usually the combination of the unique identifiers of the two entities in the many-to-many relationship.

Unary Relationships Associate occurrences of an entity type with other occurrences of the same entity type. Cardinality: One-to-One Unary Relationship One-to-Many Unary Relationship Many-to-Many Unary Relationship

Unary Relationships

Ternary Relationship Involves three different entity types.

Ternary Relationship: The General Hardware Company E-R Diagram Customer Employee, a dependent entity, is distinguished by a diagonal hash mark in each corner of its attribute area.

Good Reading Bookstores

World Music Association

Lucky Rent-A-Car

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