23 Primary Key vs Unique Key in SQL Server | Differences Explained Clearly | Interview Question
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In this video, you will learn the difference between PRIMARY KEY and UNIQUE KEY in SQL Server with clear explanations and practical examples.
This is one of the most commonly asked SQL Server interview questions, and understanding it is crucial for database design.
👉 What you will learn
What is a Primary Key in SQL Server
What is a Unique Key (Unique Constraint)
Key differences between Primary Key and Unique Key
Can PRIMARY KEY allow NULL values?
Can UNIQUE constraint allow NULL values?
How many primary keys vs unique keys per table
Real-world use cases
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