>>The SQL Server Books Online says the NULL values are not '=', but when I set up a Nullable Unique field, and try to import data into it, I get a 'Violation of UNIQUE KEY constraint'. If I turn the constraint off, it works OK, but I need the constraint, and I need it to be Nullable.
>>
>>Am I going to be able to do this??
>>
>>Thank You in advance!
>>
>>Rollin
>
>Hmm... according to SQL Books Online... you CAN do this:
>
< snip >

According to BOL Creating a Unique Index:

Note You cannot create a unique index on a single column if that column contains NULL in more than one row. Similarly, you cannot create a unique index on multiple columns if the combination of columns contains NULL in more than one row. These are treated as duplicate values for indexing purposes.