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What is the primary key in an ER model?

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Question: What is the primary key in an ER model?

Options:

  1. A unique identifier for an entity
  2. A foreign key in another table
  3. An attribute that can be null
  4. A composite of multiple attributes

Correct Answer: A unique identifier for an entity

Solution: 

The primary key is a unique identifier for an entity in an ER model.

What is the primary key in an ER model?

Practice Questions

Q1
What is the primary key in an ER model?
  1. A unique identifier for an entity
  2. A foreign key in another table
  3. An attribute that can be null
  4. A composite of multiple attributes

Questions & Step-by-Step Solutions

What is the primary key in an ER model?
No concepts available.
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