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Answer :
Here is an Entity-Relationship Diagram (ERD) in Crow's Foot notation for the car rental company database:
+--------------+
| Location |
+--------------+
| location_id |
| location_name|
+--------------+
| |
has | | offers
| |
+--------------+
| CarType |
+--------------+
| cartype_id |
| cartype_name |
| rental_charge|
+--------------+
| |
belongs to |
| |
| |
| |
| |
+--------------------+
| Vehicle |
+--------------------+
| vehicle_id |
| vehicle_number |
| cartype_id |
| location_id |
+--------------------+
| |
rented by |
| |
| |
| |
| |
| |
+-----------------------+
| Rental |
+-----------------------+
| rental_id |
| vehicle_id |
| customer_id |
| rental_date |
| return_date |
| total_payment |
+-----------------------+
|
rented by |
|
|
|
|
|
+-----------------------+
| Customer |
+-----------------------+
| customer_id |
| customer_name |
| customer_phone |
| customer_email |
+-----------------------+
Explanation:
The database consists of several entities: Location, CarType, Vehicle, Rental, and Customer.
A Location can have multiple CarTypes, indicated by the "offers" relationship.
A CarType belongs to only one Location, indicated by the "belongs to" relationship.
Vehicles belong to a specific Location and CarType, indicated by the "belongs to" relationship.
Vehicles are rented by customers, indicated by the "rented by" relationship.
Each rental is associated with a specific Vehicle and Customer.
The Customer entity stores information about customers, such as their name, phone number, and email.
The Rental entity stores information about each rental, including rental dates, return dates, and total payment.
Note: This ERD provides a basic structure for the car rental company database. Additional attributes and relationships can be added based on specific requirements and business rules.
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