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Question: The UNIQUE Constraint

Explore how to implement the UNIQUE constraint in SQL to ensure no duplicate employee names are allowed in the Employees table. This lesson helps you understand the role of constraints in maintaining data integrity and guides you through writing SQL queries to enforce uniqueness.

Question

Given the following Employees ...

Employees

EmpID

EmpName

Salary

1

Susan Lee

50000.00

2

Alexa Smith

60000.00

3

Dana Amberson

45000.00

4

Sarah Ronald

47000.00

...