What is ER Model in DBMS and what are its components?
This question asks for Entity-Relationship modeling concepts. It tests database design visualization skills.
Why Interviewers Ask This
ER diagrams are the blueprint for database design. Interviewers ask this to assess your ability to translate business requirements into data structures. It shows your conceptual modeling capabilities.
How to Answer This Question
Define ER model as a conceptual representation. Identify entities, attributes, and relationships. Explain cardinality (1:1, 1:N, M:N). Mention weak vs strong entities.
Key Points to Cover
- Entities and attributes
- Relationships
- Cardinality
- Weak vs strong entities
Sample Answer
The Entity-Relationship (ER) model represents data as entities and their relationships. Entities are objects like 'User' or 'Order', represented by rectangles. Attributes describe them, shown as ovals. Relationships conn…
Common Mistakes to Avoid
- Confusing attributes with relationships
- Ignoring cardinality
- Not distinguishing weak entities
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