Az Erdе‘rе‘l File

: 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. AZ erdЕ‘rЕ‘l

: They serve as high-level documentation of a system’s information architecture. Levels of Abstraction : The most detailed version, showing actual table

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