The UNIQUE constraint ensures all values in a specific column are distinct. Unlike a PRIMARY KEY, which enforces both uniqueness and NOT NULL, the UNIQUE constraint is more flexible:
- Allows NULL values.
- Supports multiple UNIQUE constraints on a single table.
While SSMS is popular, dbForge Studio for SQL Server offers advanced tools for creating and managing constraints, boosting productivity with intuitive features and streamlined workflows.
Discover more about SQL UNIQUE constraints in the full article.
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