1. Problem: Draw an E–R diagram for a Student–Course system showing enrolment relationship. 2. Explanation: An E–R (Entity-Relationship) diagram visually represents entities and their relationships. Here, entities are Student and Course, and the relationship is Enrolment. 3. Entities: - Student with attributes like StudentID (primary key), Name, etc. - Course with attributes like CourseID (primary key), Title, etc. 4. Relationship: - Enrolment connects Student and Course, showing which students are enrolled in which courses. 5. Diagram description: - Student and Course are rectangles. - Enrolment is a diamond connecting Student and Course. - Lines connect Student to Enrolment and Course to Enrolment. 6. This diagram helps in database design to model the system accurately. Final answer: The E–R diagram consists of two entities, Student and Course, connected by the Enrolment relationship.