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What is a primary key?

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Question: What is a primary key?

Options:

  1. A unique identifier for a record
  2. A foreign key reference
  3. An index for faster searches
  4. A type of relationship

Correct Answer: A unique identifier for a record

Solution: 

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.

What is a primary key?

Practice Questions

Q1
What is a primary key?
  1. A unique identifier for a record
  2. A foreign key reference
  3. An index for faster searches
  4. A type of relationship

Questions & Step-by-Step Solutions

What is a primary key?
Correct Answer: A primary key is a unique identifier for a record in a database table.
  • Step 1: Understand that a database is like a digital filing cabinet where information is stored in tables.
  • Step 2: Each table has rows (records) and columns (fields or attributes).
  • Step 3: A primary key is a special column in a table that holds unique values.
  • Step 4: The unique values in the primary key column ensure that each record can be identified separately.
  • Step 5: No two records in the table can have the same primary key value, which prevents confusion.
  • Step 6: Think of the primary key like a Social Security Number; each person has a unique number that identifies them.
  • 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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