Entity-Relationship Model in DBMS

The real-world problem is depicted in visual form in this model to make it easier for stakeholders to comprehend. The ER diagram also makes it very simple for developers to comprehend the system.

In this article, we will dive deeper into the Entity-Relationship Model in DBMS according to the GATE Syllabus for (Computer Science Engineering) CSE. Keep reading ahead to learn more.

Table of Contents

What is the Entity-Relationship Model in DBMS?
Features of an Entity-Relationship Model
Components of an ER Diagram
Pros of Entity-Relationship Model
Cons of Entity-Relationship Model

What is the Entity-Relationship Model in DBMS?

A high-level data model diagram is the entity-relationship model or ER Model. We depict the real-world problem in visual form in this model to make it easier for stakeholders to comprehend. The developers can also quickly grasp the system by simply looking at the ER Diagram.

Features of an Entity-Relationship Model

1. Graphical Representation for Better Understanding – It is really straightforward and easy to comprehend, so developers can use it to interact with stakeholders.

2. Database Design – This approach is extensively used in database design and aids database designers in the creation of databases.

3. ER Diagram – The ER diagram is a visual representation of the model.

Components of an ER Diagram

The ER diagram is a visual representation of an ER Model. The three components of an ER diagram are as follows:

1. Entities

An entity is a real-life concept. It could be a person, a location, or even an idea. A school management system, for example, has entities such as teachers, students, courses, buildings, departments, and so on.

2. Attributes

An attribute is a real-world property that exists in an entity. For example, the entity teacher has properties such as teacher salary, id, age, and so on.

3. Relationship

The relationship between two traits describes how they are linked. A teacher, for example, works for a department.

Example

The entities in the figure above are Teacher and Department. Teacher_id, Teacher_Name, Age, Salary, and Mobile Number are the characteristics of the Teacher object. Dept_name and Dept_id are the attributes of the Department entity. The relationship is used to connect the two entities, and each teacher is assigned to a department.

Pros of Entity-Relationship Model

1. Simple – The ER Model is simple to construct conceptually. We can easily construct the ER Diagram for the model if we know the relationship between the entities and the attributes.

2. Effective communication tool – Database designers frequently employ this model to communicate their thoughts.

3. Easy conversion to any model – This model translates neatly to the relational model, and it is simple to transform the ER model into a table. This model can be transformed into a network model, a hierarchical model, and so forth.

Cons of Entity-Relationship Model

1. No industry standard for notation – When it comes to creating an ER model, there is no industry standard. As a result, one developer may utilise notations that are unfamiliar to other developers.

2. Hidden information – In the ER model, certain information may be lost or hidden. Because it is a high-level view, there is a potential that some information specifics will be buried.

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