dineshbabus (1/3/2013)
oh.. unique constraint can allow more than one null value.. I don't think so.. Please give me some xample...
In SQL Server 2008, there is a concept of filtered indexes.
You can combine this concept with Unique Constraint to create a unique constraint which allows more than one NULL value.
How to post data/code on a forum to get the best help - Jeff Moden
http://www.sqlservercentral.com/articles/Best+Practices/61537/