title: SQL Server unique set of columns without using a constraint - getting bit by the 900 byte limit
body: <p>I have a table which contains 3 nvarchar(255) columns and a combination of these 3 columns must be unique.  Normally I would create a Unique constraint, but in this case, I am hitting the 900 byte limit.  Since I have to support SQL Server 2000, I can not use Include columns to get around this situation.</p>