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What is the primary key in an entity?

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Question: What is the primary key in an entity?

Options:

  1. A unique identifier for each record
  2. An attribute that can be null
  3. A foreign key from another entity
  4. An attribute that is not used in relationships

Correct Answer: A unique identifier for each record

Solution: 

The primary key is a unique identifier for each record in an entity.

What is the primary key in an entity?

Practice Questions

Q1
What is the primary key in an entity?
  1. A unique identifier for each record
  2. An attribute that can be null
  3. A foreign key from another entity
  4. An attribute that is not used in relationships

Questions & Step-by-Step Solutions

What is the primary key in an entity?
Correct Answer: Unique identifier for each record
  • 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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