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Unique constraint and null values

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hannelita

Post subject: Unique constraint and null values

Posted: Tue Aug 23, 2011 3:00 pm

Newbie

Joined: Tue Aug 23, 2011 2:57 pm
Posts: 6

hey all! I have a question - Is there a way to add a unique constraint with @Column but at the same time ignore this constraint for null values? (I mean, I would like to have multiple null values but don't wanna have non-null values with the same content).

Thanks :)

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nordborg

Post subject: Re: Unique constraint and null values

Posted: Tue Aug 23, 2011 4:48 pm

Expert

Joined: Wed Mar 03, 2004 6:35 am
Posts: 1240
Location: Lund, Sweden

I think that depends on which database you are using. This seems to be implemented differently. I know that MySQL has support for multiple NULL values in a UNIQUE column, but not SQL Server (last time I checked which is several years ago now).

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hannelita

Post subject: Re: Unique constraint and null values

Posted: Tue Aug 23, 2011 4:50 pm

Newbie

Joined: Tue Aug 23, 2011 2:57 pm
Posts: 6

Thanks :)

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