How can I set myself as owner of a database ? just using sql
Check this links and references:
http://technet.microsoft.com/en-us/library/ms178630.aspx

Example:

EXEC sp_changedbowner 'Albert'


and ALTER AUTHORIZATION

ALTER AUTHORIZATION ON OBJECT::Parts.Sprockets TO MichikoOsada;
GO


http://technet.microsoft.com/en-us/library/ms187359(v=sql.105).aspx