ER Diagram for Car Rental System

The car rental system ER diagram illustrates database entity relationships. The ER diagram shows the database’s logical structure. Recognize process entities, their attributes, and their interactions.

Besides, entity-relationship diagrams are used to create the automobile rental database. This sketch becomes the system’s data destination and source.

Furthermore, read or visit the other related diagrams for Car Rental System.

ER Diagram for Car Rental System: Details

The table shows the overall description of the ER Diagram for Car Rental Management System. It has a complete overview of the project’s information.

Name:Car Rental Management System ER Diagram
Abstract:The car rental management system ER diagram depicts the relationship between various entities. It can be thought of as a blueprint for your system (project) structure. 
Diagram:ER Diagram is also known as Entity Relationship Diagram
Tools Used:Diagraming tools that provide ER diagram symbols.
Users:Rental Owner, System Admin, and Clients.
Car Rental System ER Diagram: Details

What is Car Rental Management System?

Short-term car rentals are common. non-car owners, out-of-town travelers. car owners who require repairs or replacements.

Customers can rent cars online. This technology makes the company’s services public online and allows them to monitor its performance.

Online Car Rental System Features

  • This system features car rental management. ER diagrams provide system specifics. It contained client transactions and rental buses.
  • Customer Management: This feature captures crucial customer data. This data was used to track transactions and system issues.
  • A system is needed to manage bus information. because it’s how customers rent from the system. Customers were updated on this information.
  • Its features include customer rentals. The transaction date This saves and updates the customer’s requested accommodations.

What is an ER Diagram?

ER Diagrams are used to construct and troubleshoot relational databases. It works better with DFD, which moves data. ER diagrams make designing the car rental database easier.

Importance of ER Diagram

ER diagrams assist in representing a vehicle rental management system’s database. It’s the project’s database foundation. Entity-relationship diagrams (ERDs) help define data types. Their qualities and characteristics must be stored.

ER Diagram for Online Car Rental System

ER Diagram of Car Rental System shows the system entity relationships in each entity and their supposed functions in each relationship.

ER Diagram for Car Rental Management System
ER Diagram for Car Rental Management System

The Entity-Relationship (ER) Diagram for vehicle rental system tables shows admin, customer, ticket, bookings, transactions, and reports.

The system-required tables provide additional specific information about each entity.

Car Rental Management System Database Design

This database was designed to manage rental needs. Requests for car rental can be encoded. The system admin can view consumer info. You can update rental and customer transaction data.

Car Rental Management System ER Diagram Tables

These tables include field names, descriptions, data types, and character lengths. Each table shows the data storage traits.

Field column lists database characteristics. The Description column explains each attribute. Their data type is their length, while length is their character length.

Table Name: Customer

stud_ID (PK)Customer IDInt11
fnameCustomer First NameVarchar255
lnameCustomer Last NameVarchar255
genderCustomer GenderInt11
ageCustomer AgeInt11
contact_addContact AddressInt11
cust_emailCustomer EmailVarchar255
cust_passCustomer PasswordVarchar255
Table Name: Customer

Table Name: Admin

admin_ID (PK)Admin IDInt11
fnameAdmin First NameVarchar255
lnameAdmin Last NameVarchar255
genderAdmin GenderInt11
ageAdmin AgeInt11
contact_addContact AddressInt11
admin_emailAdmin EmailVarchar255
admin_passAdmin PasswordVarchar255
Table Name: Admin

Table Name: Cars

car_ID (PK)Car IDInt11
car_numberCar NumberInt11
car _modelCar ModelVarchar30
car_statusCar StatusVarchar30
rent_prizePrize RentVarchar30
driver_ID (FK)Driver IDInt11
Table Name: Cars

Table Name: Rentals

rental_ID (PK)Rental IDInt11
rental_numRental NumberInt11
date_rentRental DateDate
time_arriveTime of ArrivalTime
destinationDate of AccommodationVarchar30
date_returnReturning DateDate
Table Name: Rentals

Table Name: Transaction

trans_ID (PK)Transaction IDInt11
trans_nameTransaction NameVarchar30
rental_ID (FK)Rental IDInt11
car_ID (FK)Car IDInt11
cust_ID (FK)Customer IDInt11
admin_ID (FK)Admin ID Int11
trans_dateDate of TransactionDate
Table Name: Transaction

Table Name: Driver

driver_ID (PK)Driver IDInt11
driver_nameDriver TypeVarchar30
Table Name: Driver

Table Name: Reports

report_ID (PK)Report IDInt11
trans_ID (FK)Transaction IDInt11
rental_ID (FK)Rental IDInt11
report_date Report DateDate
Table Name: Reports

Car Rental System ER Diagram [PDF]

The Car Rental Management System ER Diagram in DBMS Pdf explains the project database. This can be used for your capstone. You can use it directly or adapt it for your purpose.

How to create an Entity-Relationship (ER) Diagram

Time needed: 5 minutes

Here are the steps on how to build ER Diagram for Car Rental System with Cardinality Ratio.

  • Step 1: Become acquainted with the ER Diagram (Entity Relationship Diagram). Symbols and Cardinality

    The Entity Relationship Diagram shows the structure of data types in a project. It uses symbols to clarify its parts and relationships. Their symbols and applications must be familiar before you build the ER Diagram.

    ER Diagram Symbols:
    Fields are the parts of a table that define the entity’s characteristics. In the database that the ERD models, attributes are commonly thought of as rows. 
    Keys are a technique to categorize data quality. It is used to organize ER diagrams and assist users in modeling their databases to ensure that they are efficient. This is also used to connect different tables in a database. 
    A primary key identifies a single entity instance, which means a unique attribute or set of attributes. 
    A foreign key is produced when data attributes have one too many relationships with other entities.

  • Step 2: Complete the entities that will be included.

    Begin designing your ER Diagram by finalizing your railway reservation system’s entities. These are rectangles. You must leave room in future phases so they can be incorporated.

  • Step 3: Add the attributes of each entity

    After finalizing the entities, think about the qualities you’ll need to characterize each entity. The details of the various entities outlined in a conceptual ER diagram are supplied as attributes. All of these are examples of attributes. Multivalued attributes can be assigned to several values.

  • Step 4: Describe the relationships (cardinality) between entities and attributes

    To plot relationships between the ERD, you will need the entities, their attributes, and relationships. You will base the data structure on the evaluated information to have the exact entity relationship diagram.


The ER (entity-relationship) diagram is only one of the diagrams used to design and develop the Car Rental System. Each of the diagrams you design and create will help you present your ideas and impart your abilities.

Creating the ER diagram will help you perceive the back end of the software. Which will hold all the data that’ll enter and exit the system. To learn more about the ER Diagrams and more, check out the related and recommended articles below.


If you have inquiries or suggestions about the Car Rental System ER Diagram, just leave us your comments below. We would be glad to know to concerns and suggestions and be part of your learning.

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