Systems Analysis and Design (Shell...

11th Edition
Scott Tilley + 1 other
ISBN: 9781305494602



Systems Analysis and Design (Shell...

11th Edition
Scott Tilley + 1 other
ISBN: 9781305494602
Textbook Problem

What are entity-relationship diagrams and how are they used? What symbol is used for a relationship? What is an associative entity? Provide an example.

Program Plan Intro

Describe entity-relationship diagram and symbols used for a relationship in an ERD. Define associative entity with the help of an example.

Program Explanation

Any real-life object interacting in a business scenario is represented in the form of an entity which has many attributes related to it, which describes characteristics of that entity. For a university environment student can be represent with the help of entity student which has multiple attributes such as Name, enrollment number, department wide, year of admission, address etc.

ER diagram is used to represent the interactions between these entities for a business environment.

An entity-relationship diagram is a graphical model that depicts the logical relationships and how these entities interact among themselves. It can provide the overall view of the system and describes the blueprint for making physical data structures.

In an ER diagram, entities are represented in the form of rectangles and relationship among them is represented with the help of square as shown in the diagram below:

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