Az Erdе‘rе‘l May 2026

: Represented as rectangles, these are the "nouns" of the system, such as Customer , Order , or Product .

: Analysts use them to identify logic errors in existing database structures. AZ erdЕ‘rЕ‘l

: They provide a common visual language for stakeholders, business analysts, and engineers to discuss data requirements. : Represented as rectangles, these are the "nouns"

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

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

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