'Entity relationship diagrams' diaporamas de présentation

Overview

Overview. What is system analysis and design? Tools and models Methodologies. Information Systems. What is a system? Why do systems fail? What is systems analysis and design? How do we do systems analysis?. What is a system?. A collection of parts that work together

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Chapter 7: Analyzing Systems Using Entity Relationship Diagrams

Chapter 7: Analyzing Systems Using Entity Relationship Diagrams. Instructor: Paul K Chen. Analyzing Systems Using Entity Relationship Diagrams. Data Model: What, Why, When? Pre-modeling Activities Conceptual Data Modeling: What, Why, When, Who? Data Modeling Approach

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Structural Modeling

SEG3101 (Fall 2010). Structural Modeling. Based on Powerpoint slides by Gunter Mussbacher , Gregor v. Bochmann , with material from:

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Lecture 8: SQL Programming and Transactions

Lecture 8: SQL Programming and Transactions. Friday, January 24, 2003. Impedance Mismatch. Example: SQL in C: C uses int, char[..], pointers, etc SQL uses tables Impedance mismatch = incompatible types. The Impedance Mismatch Problem. Why not use only one language?

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Week 9

Week 9. MySQL Joins. Differences between MSQL and Access. No Whitespace In Field Names No Bracket Notation More Functions and Keywords adding powerful features. All types of joins discussed earlier this semester are allowed. Types of Joins. Outer Join Inner Join Theta Join Equi -Join

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Getting Around in the RDA Toolkit

Getting Around in the RDA Toolkit. Marjorie E. Bloss, Lecturer Dominican University. Some Background Information. The RDA Toolkit has been developed by the three co-publishers responsible for RDA The American Library Association The Canadian Library Association

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Logical Data Structures

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Digital Media Technology

Digital Media Technology. Week 12. Today. Recapitulation The Semantic Web Semantic Publishing. Terms. Tables, Rows, Columns, Records, Fields Relational data model Data redundancy SQL. Steps. Database Design (Entity Relationship Diagrams) Implementation Data entry Data retrieval.

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What is an Entity R elationship Diagram?

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Robert Bell Anthony Helms Amanda Hollingsworth Seth Johnson Tiffany Pike Andrew Withem

Robert Bell Anthony Helms Amanda Hollingsworth Seth Johnson Tiffany Pike Andrew Withem. Agenda. Entity Relationship Diagrams Logical Database Design Use Cases Data Flow Diagrams. Entity Relationship Diagram. Logical Database Design. Employee Management. Stimulus/Response Sequences

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Entity Relationship Diagrams (ERDs)

Entity Relationship Diagrams (ERDs). Entity Relationship Diagram (ERD). documentation technique to represent relationship between entities in system . Depends on business rules !!. Cardinality. represents the numerical mapping between entities: one-to-one one-to-many many-to-many.

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DATA MODELING AND DATABASE DESIGN Part 1

DATA MODELING AND DATABASE DESIGN Part 1. Objectives. Learn the stages of system development. Define basic types of data relationships. Recognize the optionality and degree of a relationship Read an entity relationship diagram.

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Entity Relationship Diagrams

Entity Relationship Diagrams. Basic Elements and Rules. Introduction to Entity-Relationship (E-R) Modeling. Notation uses three main constructs Data entities Relationships Attributes Entity-Relationship (E-R) Diagram

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ENTITY RELATIONSHIP DIAGRAMS

ENTITY RELATIONSHIP DIAGRAMS. Moya messam. What is an entity relationship diagram?. Definition: An entity-relationship (ER) diagram is a specialized graphic that illustrates the interrelationships between entities in a database. What are the symbols used in a entity relationship diagram? .

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