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Creating a unique constraint on a column that allows nulls

published 547 days, 22 hours, 7 minutes ago posted by

sa 557 days, 51 minutes ago

Creating a unique constraint on a column that allows nulls

Primary keys, unique indexes and unique constraints all enforce uniqueness. The difference between the primary key and the unique index/constraint is that the primary key does not allow any NULL values. However whilst the unique index/constraints do allow...(read more)

category: News | clicked: 0 | | source: sqlblogcasts.com | show counter code

tags: SQL Server 2005, SQL Server 2008, Tips and Tricks

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