SQL Server Course for Beginners with 100+ examples - CHECK Constraint

The video tutorial explains the concept of the unique constraint in SQL, which ensures that all values in a specific column are different. It highlights the difference between unique and primary key constraints, demonstrating how to create a table with a unique constraint. The tutorial includes examples of inserting records while maintaining uniqueness and handling errors when attempting to insert duplicate entries. The video concludes with a summary of the unique constraint's purpose and application in SQL.

What is the purpose of a unique constraint in SQL?

Can you have multiple unique constraints in a single table? Explain your answer.

How does a unique constraint differ from a primary key constraint?

Describe the process of creating a table with a unique constraint in SQL.

What happens when you try to insert a duplicate value in a column with a unique constraint?