'Weak entity set depends' diaporamas de présentation

Entity-Relationship Model

Entity-Relationship Model. Database Management System. Agenda. Design Process Modeling Constraints E-R Diagram Design Issues Weak Entity Sets Extended E-R Features Reduction to Relation Schemas Database Design. Modeling. A database can be modeled as: a collection of entities,

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Entity-Relationship Model 1

Entity-Relationship Model 1. E-R Diagrams. Purpose of E/R Model. The E/R model allows us to sketch the design of a database informally. Designs are pictures called entity-relationship diagrams .

601 views • 60 slides

Entity-Relationship Model

Entity-Relationship Model. Lecture 5. Database Modeling and Implementation Process. Ideas. ER Design. Relational Schema. Relational DBMS Implementation. ER Model Components. Entity Sets Attributes Relationships. ER Model. title. year. Name. Address. Star-in. Movies. Stars.

739 views • 55 slides

Entity-Relationship Model

Entity-Relationship Model. Lecture 5. Database Modeling and Implementation Process. Ideas. ER Design. Relational Schema. Relational DBMS Implementation. ER Model Components. Entity Sets Attributes Relationships. ER Model.

640 views • 53 slides

Entity-Relationship Model

Entity-Relationship Model. Lecture 5. Database Modeling and Implementation Process. Ideas. ER Design. Relational Schema. Relational DBMS Implementation. ER Model Components. Entity Sets Attributes Relationships. ER Model.

562 views • 53 slides

Chapter 2: Entity-Relationship Model

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Chapter 7: Entity-Relationship Model

Chapter 7: Entity-Relationship Model. Overview of the Design Process. Creating a database application Design of the database schema Design of the programs that access and update the data Design of a security scheme to control access to data

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DATABASE MANAGEMENT SYSTEMS

DATABASE MANAGEMENT SYSTEMS. INDEX UNIT-2 PPT SLIDES S.NO Module as per Lecture PPT Session planner No Slide NO ------------------------------------------------------------------------------------------

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DATABASE MANAGEMENT SYSTEMS TERM 2011-12 B. Tech II/CSE IV Semester UNIT-II PPT SLIDES

DATABASE MANAGEMENT SYSTEMS TERM 2011-12 B. Tech II/CSE IV Semester UNIT-II PPT SLIDES. INDEX UNIT-2 PPT SLIDES S.NO Module as per Lecture PPT Session planner No Slide NO

608 views • 49 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.

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The Entity-Relationship Model

The Entity-Relationship Model. Part-3. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. More Elements in ER Model. Key Constraints Cardinality Constraints Weak Entities Subclass Entities (ISA Relationships) Principles for Good Design. Weak Entity Sets.

391 views • 39 slides

DATABASE MANAGEMENT SYSTEMS Unit-2

DATABASE MANAGEMENT SYSTEMS Unit-2. Engineered for Tomorrow. Presented by CSE, MVJCE. Engineered for Tomorrow. Database Design. Conceptual design : (ER Model is used at this stage.) What are the entities and relationships in the enterprise?

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Weak Entity Sets

Weak Entity Sets. An entity set that does not have a primary key is referred to as a weak entity set . The existence of a weak entity set depends on the existence of a identifying(or owner) entity set

1.15k views • 27 slides