In this post, we will learn how to create an ER Diagram Order Management System.
Thus, we will provide definitions and explanations for easy understanding and clarity.
Along with it is a step-by-step guide on how to create an ER Diagram.
Order Management System ER Diagram: Details
The table provides an overview of the ER Diagram for the Order Management System. It provides a complete summary of the project’s information.
| Name: | Order Management System ER Diagram |
| Abstract: | The order management system ER diagram shows 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: | Website, Applications, and Software. |
| Designer: | Sourcecodehero.com |
What is an ER Diagram?
The ER Diagram also refers to the database design of the order management system.
It is the graphical representation of the relationships between all system entities.
It consists mostly of Entities, Attributes, and Relationships.
Importance of ER Diagram
The significance of ER diagram for an order management system is that it facilitates the modeling of its data storage or database.
It is the basis for building the database foundation for the project. This entity-relationship diagram (ERD) helps define the data types to be stored, including their attributes and properties.
Hence, constructing a relational database is essential because it lets us visualize how data is generally associated.
ERD in Software Engineering
In software Engineering ERD or entity relationship diagram is used in the planning and software development phase.
It helps in the identification of various system components and their interrelationships.
So, the Order Management System ER Diagram is acting as the foundation of its DFD(Data flow Diagram).
Entity-Relationship (ER) Diagram for Order Management System
ER Diagram of Order Management System shows the included entities (data) and their supposed functions (attributes).
Each of them was represented by a table to illustrate their characteristics and relationships with each other.
Order Management System ER Diagram Tables
The tables below provide the complete database table details such as Field Name, Descriptions, data types, and character lengths.
Afterward, each of these tables represents the characteristics and the attributes of data storage.
Table Name: Customer
| Field | Description | Type | Length |
| cust_ID (PK) | Customer ID | Int | 11 |
| name | Customer Name | Varchar | 255 |
| address | Customer Address | Text | 255 |
| contact_number | Contact Number | Varchar | 255 |
| username | Username | Varchar | 255 |
| password | Password | Varchar | 255 |
Table Name: Food
| Field | Description | Type | Length |
| food_ID (PK) | Food ID | Int | 11 |
| category_ID (FK) | Category ID | Varchar | 255 |
| name | Food Name | Varchar | 255 |
| price | Food Price | Text | |
| status | Food Status | Varchar | 255 |
| stocks_number | Stocks Number | Varchar | 255 |
| quantity | Quantity | Int | 11 |
Table Name: Category
| Field | Description | Type | Length |
| category_ID (PK) | Category ID | Int | 11 |
| name | Category Name | Varchar | 255 |
| description | Description | Text |
Table Name: Payment
| Field | Description | Type | Length |
| pay_ID (PK) | Payment ID | Int | 11 |
| cust_ID (FK) | Customer ID | Int | 11 |
| food_ID (FK) | Food ID | Int | 11 |
| amount | Amount | Varchar | 255 |
| method | Payment Method | Varchar | 255 |
| status | Payment Status | Varchar | 255 |
| date | Date of Payment | Date |
Table Name: Orders
| Field | Description | Type | Length |
| order_ID (PK) | Order ID | Int | 11 |
| cust_ID (FK) | Customer ID | Int | 11 |
| food_ID (FK) | Food ID | Int | 11 |
| quantity | Quantity Orders | Int | 11 |
| payment_ID (FK) | Payment ID | Int | 11 |
| delivery_ID (FK) | Delivery ID | Int | 11 |
| date | Date of Order | Date |
Table Name: Delivery
| Field | Description | Type | Length |
| delivery_ID (PK) | Employee Id | Int | 11 |
| cust_ID (FK) | First Name | Varchar | 30 |
| status | Last Name | Varchar | 30 |
The tables given will be the basis for developers on how would they would work on the order management system database design.
It has the complete description of the database and will be applied to the program as data storage the same as the names given to each of the tables.
Order Management System ERD [PDF]
We provided here a downloadable PDF file that contains the information that explains the concepts of the project database. You can apply this information to your capstone project.
Also, you can directly modify its contents depending on your project requirements.
How to Create an ER Diagram
Time needed: 5 minutes
Steps in building the ER Diagram for Order Management System with Cardinality Ratio.
- Step 1: Familiarize the ER Diagram (Entity Relationship Diagram) Symbols and Cardinality
The Entity Relationship Diagram is the structure of the data types in a project.
It uses symbols to clarify the relationships of each entity.
Their symbols and applications must be familiarized before you build the ER Diagram.
ER Diagram Symbols:
• Fields: It is the parts of a table that define the entity’s characteristics.
• Keys: are techniques to categorize data qualities. It helps users model efficient databases, arranges ER diagrams, and connects database tables.
– Primary Key: identifies a single entity instance which means a unique attribute or set of attributes.
– Foreign Key: is created when data attributes have one too many relationships with other entities.
ER Diagram Cardinalities:
The styling and end of a line indicate cardinality and ordinality.
Cardinality refers to the maximum number of ways an instance of one thing can be connected to instances of another entity.
While Ordinality refers to the fewest ways a single instance of an entity can be linked to another instance. - Step 2: Finalize the entities included
Begin the construction of your ER Diagram by determining which entities must be included in your bank reservation system.
This entity is represented by a rectangle, and you should leave ample space in your design for their addition in subsequent phases. - Step 3: Add the attributes of each entity
After finalizing the entities, consider the characteristics that will define each one. As characteristics, a conceptual ER diagram specifies the particulars of the many things depicted. Attributes include characteristics of an entity, a many-to-many relationship, and a one-to-one relationship. Multiple values can be assigned to multivalued properties.
- 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.
Conclusion
Wrapping up, the ER diagram for the Order Management System helps to create a fully functional system. Other than that it will help you in conceptualizing the backend of the software.
Finally, the ER diagram holds all the data that enter and exit the system.
Also, you may visit the link below to learn more about diagrams.
- ER Diagram for Inventory Management System
- ER Diagram for Online Food Ordering System and Database
- ER Diagram of Restaurant Management System
- ER Diagram of Online Shopping System
- ER Diagram for Employee Management System and Database
- Sequence Diagram of Inventory Management System
- ER Diagram for E-commerce Website With Database Structure