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A unique constraint is a database design feature that ensures that no two rows in a table have the same values for a set of columns. It helps to prevent data duplication, enforce data integrity ...
For example: CREATE TABLE tab ( a INT, b STRING ); ALTER TABLE tab ADD CONSTRAINT key_a_b UNIQUE (a, b); ALTER TABLE tab ADD CONSTRAINT... The predicate is silently ignored when using ALTER TABLE ...
Technical documentation for Microsoft SQL Server, tools such as SQL Server Management Studio (SSMS) , SQL Server Data Tools (SSDT) etc. - MicrosoftDocs/sql-docs ...
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