Entity-Relationship Diagram Tutorial
An Entity-Relationship diagram (ERD) typically serves as the main deliverable of a conceptual data model. While newer approaches to E-R modeling have developed, the E-R approach is still cited by some professionals as "the premier model for conceptual database design". An ERD is a logical representation of an organization's data, and consists of three primary components:
Entities -- Major categories of data and are represented by rectangles
Attributes --
آی-ویدئو