: They serve as high-level documentation of a system’s information architecture. Levels of Abstraction
: Represented as rectangles, these are the "nouns" of the system, such as Customer , Order , or Product . AZ erdЕ‘rЕ‘l
: They provide a common visual language for stakeholders, business analysts, and engineers to discuss data requirements. : They serve as high-level documentation of a
: Analysts use them to identify logic errors in existing database structures. such as Customer
: They act as a blueprint for developers to build the actual physical database.
: Adds more detail, defining attributes and keys but remaining independent of a specific database technology.