SQL 2005 建立数据库图表时出现以下错误Database diagram support objects cannot be installed because this database does not have a valid owner 解决

在SQL2005中建立数据库图表时出现以下错误:
＂Database diagram support objects cannot be installed because this database does not have a valid owner. To continue, first use the Files page of the Database Properties dialog box or the ALTER AUTHORIZATION statement to set the database owner to a valid login, then add the database diagram support objects.＂＂Database diagram suppo