Let S be the specification: 'Instructors teach courses. Students register for courses. Courses are a

Q: What is GATE-CS?

GATE-CS is a competitive examination conducted in India. This question is from the 2024 GATE-CS Database Management Systems paper.

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This GATE-CS 2024 Database Management Systems question has a medium difficulty level and is marked as an important question.

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Question

Let S be the specification: 'Instructors teach courses. Students register for courses. Courses are allocated classrooms. Instructors guide students.' Which one of the following ER diagrams CORRECTLY represents S? (Answer is option iv)

Accepted Answer

Correct Answer: (D) Option (iv)Concept -- Entity-Relationship (ER) Modeling (from Ramez Elmasri and Shamkant Navathe, Fundamentals of Database Systems):The specification identifies the following entities and relationships:Entities: Instructor, Student, Course, Classroom.Relationships: Teach (Instructor--Course), Register (Student--Course), Allocated (Course--Classroom), Guide (Instructor--Student).The correct ER diagram must show all four entities with these four distinct relationship types. Option (iv) correctly captures all four binary relationships: Instructors teach Courses, Students register for Courses, Courses are allocated Classrooms, and Instructors guide Students. The other options either merge relationships incorrectly, omit entities, or misrepresent the relationship cardinalities or participation.

Let S be the specification: 'Instructors teach courses. Students register for courses. Courses are allocated classrooms. Instructors guide students.' Which one of the following ER diagrams CORRECTLY represents S? (Answer is option iv)

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Let S be the specification: 'Instructors teach courses. Students register for courses. Courses are allocated classrooms. Instructors guide students.' Which one of the following ER diagrams CORRECTLY represents S? (Answer is option iv)

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