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What is the primary key in an entity?
What is the primary key in an entity?
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Practice Questions
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Q1
What is the primary key in an entity?
A unique identifier for each record
An attribute that can be null
A foreign key from another entity
An attribute that is not used in relationships
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The primary key is a unique identifier for each record in an entity.
Questions & Step-by-step Solutions
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Q
Q: What is the primary key in an entity?
Solution:
The primary key is a unique identifier for each record in an entity.
Steps: 5
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Step 1: Understand what an entity is. An entity is a thing or object that can have data stored about it, like a person, car, or product.
Step 2: Know that each entity can have many records. For example, a 'Person' entity can have records for John, Jane, and Bob.
Step 3: Realize that each record needs to be unique so we can tell them apart. This is where the primary key comes in.
Step 4: The primary key is a special piece of information that is unique for each record. For example, a person's ID number can be a primary key.
Step 5: Remember that no two records can have the same primary key. This helps to avoid confusion and keeps the data organized.
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