![]() ![]() All these entities have some attributes or properties that give them their identity.Īn entity set is a collection of related types of entities. For example, in a school database, students, teachers, classes, and courses offered can be treated as entities. An entity is denoted as a rectangle in an ER diagram. In particular, the ERD effectively communicates the logic of the database to users.Īn entity can be a real-world object, either animate or inanimate, that can be merely identifiable. ![]() Finally, the ERD is used to connect the logical structure of the database to users.The ERD serves as a documentation tool.The database analyst gains a better understanding of the data to be contained in the database through the step of constructing the ERD.Diagrams created using this ER-modeling method are called Entity-Relationship Diagrams or ER diagrams or ERDs. Next → ← prev Entity-Relationship DiagramsĮR-modeling is a data modeling method used in software engineering to produce a conceptual data model of an information system.
0 Comments
Leave a Reply. |