Interview Questions/CS Fundamentals/Design an ER model for: A system where Students enroll in courses, Each course has prerequisites, Students can have multiple phone numbers, Some students are teaching assistants.
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Q.
Design an ER model for: A system where Students enroll in courses, Each course has prerequisites, Students can have multiple phone numbers, Some students are teaching assistants.
Answer
1. Start with a clear definition, then explain where the concept appears in real systems.
2. Add one practical example so the answer sounds interview-ready instead of memorized.
3. Close with trade-offs, edge cases, and the mistake candidates usually make.
- Include one concise example and one common interview caveat.
- Keep the answer structured enough to revise quickly before a technical screen.