Question: What does a primary key in an ER model signify?
Options:
A unique identifier for an entity
A foreign key reference
An attribute that can be null
A relationship type
Correct Answer: A unique identifier for an entity
Solution:
A primary key signifies a unique identifier for an entity in an ER model.
What does a primary key in an ER model signify?
Practice Questions
Q1
What does a primary key in an ER model signify?
A unique identifier for an entity
A foreign key reference
An attribute that can be null
A relationship type
Questions & Step-by-Step Solutions
What does a primary key in an ER model signify?
Correct Answer: A primary key is a unique identifier for an entity.
Step 1: Understand what an ER model is. An ER model (Entity-Relationship model) is a way to represent data and its relationships in a database.
Step 2: Identify what an entity is. An entity is a thing or object in the database that we want to store information about, like a person, place, or event.
Step 3: Learn about the primary key. A primary key is a special attribute (or a set of attributes) that uniquely identifies each entity in a database.
Step 4: Recognize the importance of uniqueness. The primary key ensures that no two entities in the database have the same identifier, which helps to avoid confusion.
Step 5: Conclude that the primary key is essential for organizing and retrieving data efficiently in an ER model.
Primary Key – A primary key is a unique identifier for each record in a database table, ensuring that no two records have the same key value.
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