Solution to: "Cannot add diagram to SQL Server 2005 DB: Database diagram support objects cannot be installed because this database does not have a valid owner." Monday, July 10, 2006 .Net 2.0 SQL Server My blog has moved. You can view this post at the following address: http://www.osherove.com/blog/2006/7/10/solution-to-quotcannot-add-diagram-to-sql-server-2005-db-dat.html