This diagram shows a user database for an online multiplayer game. All components of ER diagram are included: Entities (Red Player and Player), Relationship (Friendship), and Attributes (Email Address, Name, Nickname, Password, etc).

Edit this diagram in Gleek

Player ER diagram code in Gleek

Player–email address:oval
Player–date of birth:oval
Player–signup date:oval

name–first name:oval
name–last name:oval

Red Player–friendship–Player

About ER diagrams

We often make an entity-relationship (ER) diagram, ERD, or entity-relationship model, in the early stages of designing a database. An ERD is perfect for quickly sketching out the elements needed in the system. The ERD explains how the elements interact. ER diagrams can be shared with colleagues. Their simplicity makes them ideal even for non-technical stakeholders.

Similar ER diagram examples

Hospital management system entity-relationship diagram

Inventory management system ER diagram (Chen notation)

Simple order process entity-relationship diagram

Library management system ER diagram with Chen notation

Store sales system entity-relationship diagram