DB2, at least with the version/settings we have, seems to be able to do a CREATE UNIQUE INDEX WHERE NOT NULL, but not MS SQL Server.
Here's a further discussion of this topic... http://weblogs.sqlteam.com/davidm/archive/2004/05/21/1364.aspx
DB2, at least with the version/settings we have, seems to be able to do a CREATE UNIQUE INDEX WHERE NOT NULL, but not MS SQL Server.
Here's a further discussion of this topic... http://weblogs.sqlteam.com/davidm/archive/2004/05/21/1364.aspx