23 Primary Key vs Unique Key in SQL Server | Differences Explained Clearly | Interview Question

Complete playlist is here: https://www.youtube.com/playlist?list=PLKFKd7UiwVxMiV9Cy7gaF8A_ylx4FuFA9 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 primary key vs unique key difference between primary key and unique key sql server primary key sql server unique constraint primary key vs unique sql server sql constraints tutorial