'Ternary relationship' diaporamas de présentation

Chapter 5: Logical Database Design and the Relational Model

Modern Database Management 8th Edition Jeffrey A. Hoffer , Mary B. Prescott, Fred R. McFadden. Chapter 5: Logical Database Design and the Relational Model. By: Aatif Kamal Dated: March 2008. Objectives. Definition of terms List five properties of relations

1.15k views • 92 slides

Chapter 5: Logical Database Design and the Relational Model

Chapter 5: Logical Database Design and the Relational Model. Modern Database Management Jeffrey A. Hoffer, Mary B. Prescott, Fred R. McFadden. Objectives. Definition of terms List five properties of relations State two properties of candidate keys

1.04k views • 75 slides

Chapter 4: Logical Database Design and the Relational Model

Modern Database Management. Chapter 4: Logical Database Design and the Relational Model. Define terms List five properties of relations State two properties of candidate keys Define first, second, and third normal form Describe problems from merging relations

1.26k views • 57 slides

Chapter 5: Logical Database Design and the Relational Model

Chapter 5: Logical Database Design and the Relational Model. ? : ? 11 ?? Chapter 4. ????? ???????. Relation. Relation is a named, two-dimensional table of data ????? Table consists of rows ? (records ?? ) and columns ? (attribute ?? or field ?? )

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Database Management Systems (DBMS)

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Logical Database Design and the Relational Model (part 2)

Logical Database Design and the Relational Model (part 2). CS263 Lecture 6 . Step 5: map unary relationships. Unary relationships are relationships between the instances of a single entity type They are also called recursive relationships

984 views • 50 slides

Mapping from Data Model (ERD) to Relational Model

Mapping from Data Model (ERD) to Relational Model. Yong Choi School of Business CSUB. Objectives of logical design. Transform the conceptual database design into a logical database design that can be implemented on a chosen DBMS later Input: conceptual model (ERD)

882 views • 39 slides

Comp 3311 Database Management Systems

Comp 3311 Database Management Systems. 2. Entity Relationship (ER) Model. Basic Concepts of ER. A database can be modeled as a collection of entities relationship among entities An entity is an object that exists independently and is distinguishable from other objects.

399 views • 39 slides

Logical Database Design and the Relational Model

Logical Database Design and the Relational Model. Relation. Definition: A relation is a named, two-dimensional table of data Table consists of rows (records) and columns (attribute or field) Requirements for a table to qualify as a relation: It must have a unique name

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Chapter 11 (I)

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Chapter 11 (I)

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Chapter 11 (I)

387 views • 32 slides

Chapter 6: Entity-Relationship Model (part I)

Chapter 6: Entity-Relationship Model (part I). Modeling. A database can be modeled as: a collection of entities, relationship among entities. An entity is an object that exists and is distinguishable from other objects. Example: specific person, company, event, plant

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570 views • 30 slides

CSE 480: Database Systems

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Database

Database. Basic Definitions. Database: A collection of related data. Database Management System (DBMS): A software package/ system to facilitate the creation and maintenance of a computerized database.

486 views • 28 slides

Database

Database. Basic Definitions. Database: A collection of related data. Database Management System (DBMS): A software package/ system to facilitate the creation and maintenance of a computerized database.

690 views • 24 slides