sql server 2005 unique constraint allow null

You cannot create a UNIQUE constraint and allow NULLs. . for creating an in...

You cannot create a UNIQUE constraint and allow NULLs. . for creating an indexed view in SQL Server () (also later versions), ().

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Change UNIQUE constraint to allow multiple NULL values - by Hugo Kornelis S...

Change UNIQUE constraint to allow multiple NULL values - by Hugo Kornelis SQL Server has always implemented a crippled version of this, allowing a single .. for SQL Server SP4, SQL Server SP2 and the product release for.

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Actually, I had to do something like this once. It involved creating a comp...

Actually, I had to do something like this once. It involved creating a computed column that takes the value of the Unique column when is not.

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There's nothing special that would prevent you from using a standard u...

There's nothing special that would prevent you from using a standard unique constraint here, unless there's something you aren't telling us.

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Microsoft SQL Server introduces filtered indexes, allowing you to request -...

Microsoft SQL Server introduces filtered indexes, allowing you to request -- to create a unique constraint that supports multiple NULLs.

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The entry for "Unique Constraint" in SQL Server Books Online (BOL...

The entry for "Unique Constraint" in SQL Server Books Online (BOL) specifically says that you can create a unique constraint on columns that allow NULL.

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Regardless of the ANSI_NULLS setting, SQL Server treats Null as a discrete ...

Regardless of the ANSI_NULLS setting, SQL Server treats Null as a discrete value That is, it allows at most a single Null value in a unique column. Note: If you are using at least SQL , you might be able to squeeze.

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However whilst the unique index/constraints do allow null values they only ...

However whilst the unique index/constraints do allow null values they only allow one of them. Well thats obvious Ok thats fine but what about SQL Friday, July 30, PM by SimonS Blog on SQL Server Stuff.

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Unique constraint will accept only 1 NULL value but in my situation it shou...

Unique constraint will accept only 1 NULL value but in my situation it should be On SQL Server , a related solution is to use an indexed view: column that can allow multiple NULL values and unique non-null values?

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ANSI SQL allows columns with UNIQUE constraints to have multiple NULLs. How...

ANSI SQL allows columns with UNIQUE constraints to have multiple NULLs. How to set a unique key in SQL server ? Why can't a.

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As you know, when you create a UNIQUE constraint on a nullable column, SQL ...

As you know, when you create a UNIQUE constraint on a nullable column, SQL Server allows only one NULL value, thereby maintaining the.

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When you click the Save icon on the toolbar, SQL Server creates the unique ...

When you click the Save icon on the toolbar, SQL Server creates the unique The second difference is that unique constraints allow null (blank) values to be.

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Please note that COL2 is a nullable column and that SQL Server does is to h...

Please note that COL2 is a nullable column and that SQL Server does is to have a computed column and define the unique constraint on it.

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SQL Server treats NULL as a value. unique index or a unique constraint on a...

SQL Server treats NULL as a value. unique index or a unique constraint on a column that allows NULLs Previous Post Getting Started with Diskspd Next Post What's More Popular: SQL Server , or SQL Server ?

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An interesting workaround using unique fieldsUnique fields in SQL Server ar...

An interesting workaround using unique fieldsUnique fields in SQL Server are created using unique constraints or unique indexes, furthermore.

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