Entity Relationship Diagram Example: College


ERD is a graphical representation of a conceptual structure of a problem domain being modeled. This is an ER diagram example that shows the business objects within a college, which includes department, instructor, course and student.

Use this ERD template to get started building your own. Customize the ERD to reflect the entities of your problem. Click Use this Template to start.

What is Entity Relationship Diagram?

Entity relationship diagrams (ERD) are widely used in database design and systems analysis to represent systems or problem domains. An ER diagram is a pictorial representation of the information that can be captured by a database. It allows database professionals to describe an overall data model of a system concisely yet accurately and can be easily transformed into the relational schema. The ERD is an implementation-independent representation of a problem domain and it facilitates communication between the end-user and the analyst.

Conceptual Design vs Logical Design vs Physical Design ERD

Conceptual Database Design produces the initial model of the mini world in a conceptual data model similar to the Entity-Relationship-Model).

Logical Database Design transforms this schema into the data model supported by the DBMS to be used similar to the relational model.

Physical Database Design aims at improving the performance of the final database system.

During conceptual design, we should focus is on producing a correct model of the real world. There is no need to worry about performance aspects or limitations of a specific DBMS.

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