What is purpose of the ER diagram ? Construct an ERdiagram for a University system which should include information about students, departments, professors, courses, which students are enrolled in which course, which professors are teaching which courses, student grades, which course a department offers.
Purpose of ER diagram:
Representation of Database Structure: ER diagrams are used to visually represent the overall logical structure of a database. They provide a high-level view of how different entities in a system are related to each other.
Focus on Schema: ER diagrams emphasize the database schema, which defines the structure of the database. The schema includes entities, their attributes, and the relationships between entities. This focus helps in designing and understanding the database structure.
Communication with End Users: ER diagrams are a useful communication tool to convey the logical structure of the database to non-technical stakeholders or end users. They provide a clear and intuitive way to understand how data is organized and related in the system.
Documentation: ER diagrams serve as documentation for database designers and developers. They document the entities, attributes, and relationships, making it easier for anyone working on the database to understand its structure.
Aiding Database Design: ER diagrams assist database designers in understanding the information that needs to be stored in the database. They help in identifying entities, their attributes, and the relationships between entities, guiding the design process.
ER diagram:
