Database Diagram Support Objects cannot be Installed … no valid owner

Question

I tried to create a database diagramm with SQL Server 2008, but an error occurs:

Database diagram support objects cannot be installed because this dat

Answer 1

An easier way to solve this issues would be to right click the name of your database, choose "New Query", type " exec sp_changedbowner 'sa' " and execute the query. Then you'll be good to go.