Az Erdе‘rе‘l -

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

: Adds more detail, defining attributes and keys but remaining independent of a specific database technology. AZ erdЕ‘rЕ‘l

An is a visual report used to design and model relational databases by illustrating how different "entities" (like people, objects, or concepts) relate to one another within a system. Core Components of an ERD : Represented as diamonds or connecting lines, these

: Defines the numerical relationship between entities, such as one-to-one , one-to-many , or many-to-many . Why ERDs are Useful Core Components of an ERD : Defines the

: The most detailed version, showing actual table structures, data types, and constraints for a specific database management system.

: Analysts use them to identify logic errors in existing database structures.

: They provide a common visual language for stakeholders, business analysts, and engineers to discuss data requirements.