What is ER model in the DBMS?
Tests knowledge of Entity-Relationship modeling for designing database schemas.
Why Interviewers Ask This
ER models are the blueprint for databases. Interviewers assess your ability to visualize and plan data structures before implementation.
How to Answer This Question
Define ER model as a conceptual representation of entities and relationships. Explain entities, attributes, and relationships. Discuss cardinality ratios. Mention how it translates to relational tables.
Key Points to Cover
- Entity definition
- Attributes and Relationships
- Cardinality
- Schema planning
Sample Answer
The Entity-Relationship model represents data as entities, attributes, and relationships between them. Entities are objects like 'Customer', attributes are properties like 'Name', and relationships define interactions like 'Places Order'. This model serves as a blueprint for designing efficient and normalized relational databases.
Common Mistakes to Avoid
- Confusing with physical model
- Ignoring cardinality
- Failing to mention normalization
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