In the Table Designer go to Check Constraints and add it.
>Maybe Check constraint is what I should use. I will look it up in my SQL Server book on how create it. Thank you.
>
>>I'm confused. Do you need Unique constraint or Check constraint? A Table Check constraint can reference more then one column of the table to which it belongs. A Unique constraint does not support expressions, only column list.
>>
>>>
--sb--