'Entity relationship model' diaporamas de présentation

Chapter 3 Data Modeling Using the Entity-Relationship Model

Chapter 3 Data Modeling Using the Entity-Relationship Model. Entity Relationship Model (ER). ER model was proposed by Peter Chen in 1976 ER model has become the standard tool for conceptual schema design

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Entity-Relationship (E-R) Model

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Chapter 2

Chapter 2. Data Models. In this chapter, you will learn:. Why data models are important About the basic data-modeling building blocks What business rules are and how they affect database design How the major data models evolved, and their advantages and disadvantages

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Entity Relationship Model

Entity Relationship Model. Overview. Database design is essentially to decide the set of tables needed to store all the data in the underlying applications; capture the relationships among data. Design steps: Requirement analysis Conceptual database design Logical database design

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Database Systems: Design, Implementation, and Management Tenth Edition

Database Systems: Design, Implementation, and Management Tenth Edition. Chapter 2 Data Models. Data Modeling and Data Models. Data models Relatively simple representations of complex real-world data structures Often graphical Model: an abstraction of a real-world object or event

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Database Fundamentals

Database Fundamentals. Databases. A database is a collection of data. How that data is organized determines what type of database it is.

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Database Systems: Design, Implementation, and Management Tenth Edition

Database Systems: Design, Implementation, and Management Tenth Edition. Chapter 4 Entity Relationship (ER) Modeling. Objectives. In this chapter, students will learn: The main characteristics of entity relationship components

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Database Systems: Design, Implementation, and Management Eighth Edition

Database Systems: Design, Implementation, and Management Eighth Edition. Chapter 2 Data Models 2-11-2011. Objectives. About data modeling and why data models are important About the basic data-modeling building blocks What business rules are and how they influence database design

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Entity-Relationship Diagrams and the Relational Model

Entity-Relationship Diagrams and the Relational Model. CS 186, Fall 2007, Lecture 2 R & G, Chaps. 2&3. A relationship, I think, is like a shark, you know? It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark. Woody Allen (from Annie Hall, 1979).

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The Entity-Relationship Model (Chapter 2)

The Entity-Relationship Model (Chapter 2). 1. Main Phases of Database Design. 2. Overview of Database Design. Conceptual design : ( ER Model is used at this stage.) What are the entities and relationships in the enterprise?

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Process Modeling with ARIS Why students around the world like to learn BPM based on ARIS

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Databases & SQL

Databases & SQL. By: Julia Tartakovsky CS 340, Fall 2004 Acknowledgement (for help with the J# code connecting to an Oracle DB): Yosef Lifshits. Database Management System (DBMS). A DBMS is: A collection of interrelated data (a database), and A set of programs to access the data

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What is a Database Management System?

What is a Database Management System?. 1. Manages very large amounts of data. 2. Supports efficient access to very large amounts of data. 3. Supports concurrent access to very large amounts of data. Example: bank and its ATM machines.

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The Entity-Relationship Model

The Entity-Relationship Model. Chapter 2. Objectives. Overview of database design Requirement analysis, conceptual design , logical design, normalization, and physical design The entity-relationship (ER) model Basic constructs: Entities Relationships

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Chapter 3

Chapter 3. Data Modeling Using the Entity-Relationship Model. FIGURE 3.1 A simplified diagram to illustrate the main phases of database design. FIGURE 3.2 An ER schema diagram for the COMPANY database. FIGURE 3.3 Two entities, employee e 1 and company c 1 , and their attributes.

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CONCEPT OF DATABASE

CONCEPT OF DATABASE. Contents. Database Definition What Is a DBMS? DBMS Purpose of Database System Why Use a DBMS? Levels of Abstraction Example of database Data Independence Data Models Entity-Relationship Model. Database Definition.

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Entity-Relationship Model

Entity-Relationship Model. Entity-Relationship Mode. What is it? Technique for developing an informal organization of tables How does it work? Identify entities (which become tables) Identify attributes of each entity (which become fields) Identify relationships. Notation. Entity

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CHAPTER 6.1

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Entity Relationship Model for SHCN Program and Funding data

Entity Relationship Model for SHCN Program and Funding data. Data. Cost Centre. Classification. Cost_centre Classn Eft_basic Eft_otime Eft_wcover Eft_productive Eft_non-productive. Cost_cent Cent_desc Campus Fund Prog_no. Classn Class Name Award_no Labour_category. Fund.

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