Erdе‘rе‘l: Az

: Represented as ovals, these describe the specific characteristics of an entity (e.g., a Customer entity might have attributes like Name or Email ).

For professional modeling, tools like Lucidchart or Visual Paradigm are widely used to create and share these diagrams. What is an Entity Relationship Diagram (ERD)? - Lucidchart AZ erdЕ‘rЕ‘l

: Adds more detail, defining attributes and keys but remaining independent of a specific database technology. : Represented as ovals, these describe the specific

: Defines the numerical relationship between entities, such as one-to-one , one-to-many , or many-to-many . Why ERDs are Useful : Represented as ovals

: Represented as diamonds or connecting lines, these show how entities interact (e.g., a Customer "places" an Order ).

: They serve as high-level documentation of a system’s information architecture. Levels of Abstraction