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Ch03 4770 4/4/07 12:09 PM Page 33 CHAPTER three EntityRelationship Modeling chapter W OVER VI 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 Introduction
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How to fill out entity relationship model:

01
Begin by identifying the entities involved in the system or process you are modeling. These entities can represent people, objects, events, or concepts.
02
Determine the attributes or properties of each entity. These attributes describe the characteristics or qualities of the entities.
03
Establish the relationships between the entities. Define how they are related to each other through associations, connections, or dependencies.
04
Specify the cardinality and participation constraints for each relationship. Cardinality defines the number of instances an entity can be associated with, while participation constraints determine if the relationship is mandatory or optional for an entity.
05
Refine and normalize the model to eliminate redundancies and ensure data integrity. This involves identifying functional dependencies, normalizing the tables, and applying appropriate normalization rules.

Who needs entity relationship model:

01
Database developers and administrators use entity relationship models to design and manage databases. The model provides a clear representation of the underlying data structure and relationships, aiding in database creation, modification, and maintenance.
02
System analysts and designers utilize entity relationship models to understand the data requirements of an information system. The model serves as a blueprint for system development, helping to identify the necessary data entities and their relationships.
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Business stakeholders and decision-makers can benefit from entity relationship models to gain insights into their organization's data landscape. The model visualizes how different entities within the business interact, facilitating better understanding and informed decision-making.
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The entity relationship model is a data model that describes the relationships between different entities in a database.
Database designers, developers, and administrators are required to create and maintain entity relationship models.
Entity relationship models are filled out by identifying entities, attributes, and relationships between entities in a visual diagram.
The purpose of entity relationship models is to help organize and understand the structure of a database, making it easier to design, implement, and maintain.
Entity relationship models must report entities, attributes, and relationships between entities.
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