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What does a primary key do in an ER model?

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Question: What does a primary key do in an ER model?

Options:

  1. Links two entities
  2. Identifies a unique record
  3. Defines a relationship type
  4. Stores multiple values

Correct Answer: Identifies a unique record

Solution: 

A primary key uniquely identifies a record in a database table.

What does a primary key do in an ER model?

Practice Questions

Q1
What does a primary key do in an ER model?
  1. Links two entities
  2. Identifies a unique record
  3. Defines a relationship type
  4. Stores multiple values

Questions & Step-by-Step Solutions

What does a primary key do in an ER model?
Correct Answer: A primary key uniquely identifies a record in a database table.
  • Step 1: Understand that a database table is like a spreadsheet with rows and columns.
  • Step 2: Each row in the table represents a unique record, like a single person or item.
  • Step 3: A primary key is a special column in the table that gives each row a unique identifier.
  • Step 4: This means no two rows can have the same value in the primary key column.
  • Step 5: The primary key helps us find, update, or delete a specific record easily.
  • Primary Key – A primary key is a unique identifier for a record in a database table, ensuring that no two records can have the same key value.
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