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Microsoft SQL Server
Yes you can have a contraint on a field that allows nulls. However, you cannot have nulls in a Primary constraint, and you can only have 1 in a Unique constraint.
Jon
>Hi all,
>
>is it possible to add a constraint on field that can cantain the null value. And if so can the file contain multiple records with the null value for that field with the constraint active ?
>
>thnx
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