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  3. Pagina 19

Chapter 9 Integrity Rules and Constraints

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

Constraints are a very important feature in a relational model. In fact, the relational model supports the well-defined theory of constraints on attributes or tables. Constraints are useful because they…

Lees verderChapter 9 Integrity Rules and Constraints

Chapter 8 The Entity Relationship Data Model

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

The entity relationship (ER) data model has existed for over 35 years. It is well suited to data modelling for use with databases because it is fairly abstract and is easy to…

Lees verderChapter 8 The Entity Relationship Data Model

Chapter 7 The Relational Data Model

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

The relational data model was introduced by C. F. Codd in 1970. Currently, it is the most widely used data model. The relational model has provided the basis for: Research on…

Lees verderChapter 7 The Relational Data Model

Chapter 5 Data Modelling

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

Data modelling is the first step in the process of database design. This step is sometimes considered to be a high-level and abstract design phase, also referred to as conceptual design.…

Lees verderChapter 5 Data Modelling

Chapter 6 Classification of Database Management Systems

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

Database management systems can be classified based on several criteria, such as the data model, user numbers and database distribution, all described below. Classification Based on Data Model The most popular…

Lees verderChapter 6 Classification of Database Management Systems

Chapter 4 Types of Data Models

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

High-level Conceptual Data Models High-level conceptual data models provide concepts for presenting data in ways that are close to the way people perceive data. A typical example is the entity…

Lees verderChapter 4 Types of Data Models

Chapter 3 Characteristics and Benefits of a Database

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

Managing information means taking care of it so that it works for us and is useful for the tasks we perform. By using a DBMS, the information we collect and…

Lees verderChapter 3 Characteristics and Benefits of a Database

Chapter 2 Fundamental Concepts

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

What Is a Database? A database is a shared collection of related data used to support the activities of a particular organization. A database can be viewed as a repository…

Lees verderChapter 2 Fundamental Concepts

Chapter 1 Before the Advent of Database Systems

  • Bericht gepubliceerd op:12 december 2013
  • Berichtcategorie:Opdrachten

The way in which computers manage data has come a long way over the last few decades. Today's users take for granted the many benefits found in a database system.…

Lees verderChapter 1 Before the Advent of Database Systems
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