Shopping Cart ER Diagram | Entity Relationship Diagram

The shopping cart ER diagram reveals the relationships of the shopping cart entities within the database. This describes the logical structure of the system’s database or data storage. It is done by identifying the online shopping process entities, their properties, and the interactions between them.

The database design is sketched out using online shopping cart ER diagrams. This database sketch becomes the actual basis of the system’s data storage that will serve as data destination and source.

Shopping Cart ER Diagram: Details

The table shows the overall description of the ER Diagram for Shopping Cart. It has a complete overview of the project’s information.

Name:Shopping Cart ER Diagram
Abstract:The online shopping cart 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:Website, Applications, and Software.
Shopping Cart ER Diagram: Details

What is a Shopping Cart?


Shopping cart software is part or equal to an e-commerce software that runs on a web server and allows visitors to an Internet site to choose things for purchase. Customers who shop online can create a wish list of products to buy using the software. Its goal is to aid online merchants with big client records by providing at least a simplified self-service option.

The entire purchasing process is automated with a shopping cart system. This statement explains that there is less work for online sellers and a simple transaction for online customers using a shopping cart. Sellers can save time, and money, and keep the customers happy by delegating the task to the shopping cart.

What is an ER Diagram?

The ER Diagram is referred to as the online shopping cart’s database design. This ER Diagram is the graphical depiction of relationships between all the entities involved in the system. Its major components are Entities, Attributes, and Relationships.

To build and troubleshoot relational databases, the online shopping cart ER Diagram is used. It works best with DFD (Data Flow Diagram), which is responsible for data movement. Designing the online shopping cart’s database would be much easier with the help of ER diagram.

Importance of ER Diagram for Shopping Cart

The importance of ER diagram for online shopping cart is to help in modeling its data storage or database. It is the basis of the project’s database foundation for construction. This entity-relationship diagram (ERD) also aids in defining the data types to be stored such as their attributes and characteristics.

In addition to that, the ER Diagram also describes how an entity interacts with other entities. All other real-world projects are presented with ER Diagrams (database designs). To display the details and attributes of a data store, the er diagram for online shopping cart is used in conjunction with its data flow diagram. They are very important in building a relational database because they let us visualize how data is connected in a generic fashion.

Entity-relationship diagrams are utilized in software engineering during the planning phase of software development. It aids in the identification of various system constituents and their interrelationships. Online Shopping ER Diagram is also used as the foundation of the shopping cart DFD (Dataflow Diagram)

Online Shopping Cart ER Diagram

ER Diagram of Online Shopping Cart shows the system entity and the supposed functions in each relationship. It is the supposed database design of the project. This conveys the data that would be present in the registration system, its characteristics, and its connection with other data (entity).

ER Diagram for Online Shopping Cart
ER Diagram for Online Shopping Cart

This diagram presents the entities’ relational model for the online shopping cart. It is used to enlighten you on how the back end of the database of the project works. The tables are made to meet the required specification of the system and provide much more specific details of each entity within the system.

ER Diagram for Online Shopping Cart: Tables

These tables below provide the complete database table details such as Field NameDescriptionsdata types, and character lengths. Each of these tables represents the characteristics and the attributes of data storage.

The field column presents the names of each database’s attributes, the description column gives the complete thought of each attribute, the type column is their data type and the length is for their character lengths.

Table Name: User Accounts

user_ID (PK)User IDInt11
type_ID (FK)Type IDInt11
nameUser NameVarchar255
contact_numberContact NumberVarchar255
Table Name: User Accounts

Table Name: Products

product_ID (PK)Product IDInt11
category_ID (FK)Category IDInt11
user_IDUse IDInt11
Table Name: Product

Table Name: User Types

Field DescriptionTypeLength
type_ID (PK)Account Type IDInt11
type_nameType NameVarchar255
Table Name: User Types

Table Name: Payment

payment_ID (PK)Login IDInt11
user_ID (FK)User IDInt11
Table Name: Payment

Table Name: Cart

cart_ID (PK)Cart IDInt11
product_IDProduct IDInt11
user_ID (FK)User IDInt11
Table Name: Cart

Table Name: Order

order_ID (PK)Order IDInt11
user_Id (FK)User IDInt11
cart_ID (FK)Cart IDInt11
Table Name: Cart

Table Name: Categories

category_ID (PK)Category IDInt11
category_nameCategory NameVarchar255
Table Name: Categories

Table Name: Deliveries

delivery_ID (PK)Delivery IDInt11
user_ID FK)User IDInt11
Table Name: Transaction

Table Name: Transaction

transaction_ID (PK)Transaction IDInt11
trans_ypeTransaction TypeVarchar255
user_ID (FK)User IDInt11
Table Name: Transaction

The tables given will be the basis for developers on how would they design the online shopping cart database. It has the complete description of the database and they will put this into the program or data storage the same as the names given to each of the tables. They will create a database with the attributes given as well as the value of each attribute.

Online Shopping Cart ERD [PDF]

The ER Diagram for Online Shopping PDF provides the information explaining the concepts of the project database. You may apply this information to your capstone project. You can also use it directly or modify its content depending on your project’s requirements.

How to create ER Diagram

Time needed: 5 minutes.

Steps in building the ER Diagram for Online Shopping Cart with Cardinality Ratio.

  • Step 1: Familiarize the ER Diagram (Entity Relationship Diagram) Symbols and Cardinality

    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 familiarized before you build the ER Diagram.

    ER Diagram Symbols:
    Fields: 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 is a technique to categorize data qualities. 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.
    – Primary Key: identifies a single entity instance which means a unique attribute or set of attributes.
    – Foreign Key: is produced when data attributes have one too many relationships with other entities.

    ER Diagram Cardinalities:
    The styling of a line and its termination demonstrates cardinality and ordinality.
    The greatest number of times an instance of one thing can be related to instances of another entity is referred to as cardinality.
    While Ordinality refers to the fewest number of times a single entity instance can be linked to another.

  • Step 2: Finalize the entities included

    Start designing your ER Diagram by finalizing the entities that must be included in your online shopping cart. This entity is represented by a rectangle, and you’ll want to leave plenty of room for them in future phases so you may add them to your design.

    An entity set is a group of similar entities with shared properties. A table or a table’s attribute is an entity in a database management system. As a result, by depicting relationships between tables and their characteristics, an ER diagram displays the whole logical structure of a database.

  • 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. Characteristics of an entity, a many-to-many relationship, or a one-to-one relationship are all examples of attributes. Multivalued attributes can be assigned to several values.

    The entity’s attributes were represented by ovals and can be seen in the tables of the online shopping cart er diagram. These attributes can be a primary key or a foreign key in the database design of the project. Yoy ER diagram design could also be converted to the database of the system by declaring your right entities and their attributes.

  • 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 from the evaluated information to have the exact Entity Relationship Diagram.

    A relationship is an association that describes how two entities interact. At the connector’s endpoints, the cardinality is indicated by a crow’s foot. One-to-one, one-to-many, and many-to-many are the three most common cardinal relationships. It’s the maximum number of times an instance of one entity can be linked to instances of another entity.


You need to know the diagrams used to design and develop the Online Shopping Cart. That is to help you create a fully-functional system with the use of ER Diagram. Creating it will help you perceive the back end of the software. This will hold all the data that’ll enter and exit the system.

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