“dual” is a special reference in the Oracle world.
Rather than trying to solve how to “create” a dual table in SQL Server – the real question is how one achieves this sort of functionality for SQL Server.
If you look at the Designer FAQ in this very forum, you’ll find that the entry that discusses this very subject tells you how to do it for SQL Server.
Anita Craig 
(BOB member since 2002-06-17)