'Weak entity set' diaporamas de présentation

Relational Data Model

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Chapter Four Database Design (Relational)

Chapter Four Database Design (Relational). Objectives Summary Keys (Constraints) Relational DBMS Normal Forms. Summary. DB Lifecycle Business Requirements Design (ER) Build DB Production Architecture of DBMS Definitions Data Models Database Design (ER Model) Strong Entity

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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.

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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.

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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 TERM 2010-11 B. Tech IV/EEE II Semester UNIT-II PPT SLIDES

DATABASE MANAGEMENT SYSTEMS TERM 2010-11 B. Tech IV/EEE II Semester UNIT-II PPT SLIDES Text Books: (1) DBMS by Raghu Ramakrishnan (2) DBMS by Sudarshan and Korth. INDEX UNIT-2 PPT SLIDES S.NO Module as per Lecture PPT

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The Entity-Relationship (E-R) Model

The Entity-Relationship (E-R) Model. Lecture Topics Basic E-R modelling Extensions to E-R modelling Designing an E-R schema Deriving relational schema from E-R diagrams Textbook Chapter 2 Section 3.5. Overview of E-R model. used for database (conceptual schema) design

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History of Database Systems

History of Database Systems. 1950s and early 1960s: Data processing using magnetic tapes for storage Tapes provide only sequential access Punched cards for input Late 1960s and 1970s: Hard disks allow direct access to data Network and hierarchical data models in widespread use

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5 . ?? - ??? ?? (Entity-Relationship Model)

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Chapter 3: Relational Model I

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Entity-Relationship Model

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The Entity-Relationship Model To Relational Model

The Entity-Relationship Model To Relational Model. Relationship Example. since. name. dname. psrn. budget. dob. did. Works_In. Employees. Departments. Relationship Sets to Tables. In translating a relationship set to a relation, attributes of the relation must include:

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Lecture 2: Entity/Relationship modelling

Lecture 2: Entity/Relationship modelling. www.cl.cam.ac.uk/Teaching/current/Databases/. Dr. Peter Chen http://bit.csc.lsu.edu/~chen/. Database design lifecycle. Requirements analysis User needs; what must database do? Conceptual design High-level description; often using E/R model

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E-R Model to R elational Model

E-R Model to R elational Model. E-R Model to R elational Model. Entity Sets to Tables Main Idea Each entity set maps to a new table Each attribute maps to a new table column Each relationship set maps to either new table columns or to a new table.

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Department of Computer and Information Science, School of Science, IUPUI

Department of Computer and Information Science, School of Science, IUPUI. Data Modeling Attributes, Roles, Subclasses, Keys and Weak Entities. Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu. Attributes on Relationships.

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Weak Entity Sets

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Entity-Relationship Model

Entity-Relationship Model. Contents. Entity-relationship models (ERM) Simple E-R Diagram Weak Entity Strong Entity Entity vs. Attribute. Entity-relationship models (ERM).

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COP4710 Database Systems

COP4710 Database Systems. Midterm Review. Fall 2013. Midterm Exam. Time : Friday 10/18/2012 9:05am --- 9:55am Plan your time well Venue : HCB 315, in-class exam Closed book, closed note, but you can bring a piece of cheat sheet (A4, double side) Plan your strategy well

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E-R Diagram for a University Enterprise

E-R Diagram for a University Enterprise. Reduction to Relational Schemas. A strong entity set reduces to a schema with the same attributes student( ID , name, tot_cred)

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