By linking entities, their attributes and their relationships, ERD helps determine all the requirements of an information system during its initial phase.Įntity Relationship diagrams are very useful in creating an online shopping system. Moreover, an ERD helps identify all the data that needs to be stored in the database. It allows you to map all the information in a graphical manner that is easy to understand and interpret. Using an ER diagram, you can resolve many problems during the planning phase of the information system rather than at the execution or testing phase. An ERD comes very handy here, where all entities are named and linked together to ensure the software caters to them all. You need to consider the user interface, admin interface, how the products will be identified and the whole billing process.

You might be thinking, how is it related to Information systems? ER diagrams are handy in mapping out the functions the software will perform and how it will link different entities together.įor example, if you are making an online shopping system, you might have to look at the software from different perspectives. Now that you understand what an ER diagram is. A sequence diagram descends from top to bottom showing a sequence of interactions and sequence diagram notations.ER Diagram Examples for Online Shopping Systems Sequence diagrams show how all the different parts interact with each other over time, carry out the required actions, and complete processes.

Sequence or event diagrams help create an overview of how a system works. Online store- Confirmation->User About sequence diagrams Online store- Pay with card-> PaymentGateway User- Choose gift wrapping-> Online store User- Add item to the card -> Online store The user pays the bill and gets payment confirmation.Įdit this diagram in Gleek Online shopping diagram code in Gleek If the customer chooses payment by bank transfer, the online store provides the transfer information to the user. If the user chooses card payment, they enter their card details and the online store sends the request to the payment gateway. When it comes to payment, they have two options: card payment and payment by bank transfer (alternative fragment). When proceeding with the purchase, the user can choose gift wrapping (optional fragment). This sequence diagram starts when a user adds an item to their card.

System sequence diagram online shopping