You are currently a server administrator in the database server you are using for these exercises. Observe that data you create when you are logged in as a server administrator is owned by dbo. The dbo group in SQL Server is basically equivalent to a sysadmin user, which confers the highest level of control over the SQL Server instance and its contents. Being part of the dbo group also means that all the data you create is stored in the dbo schema in the database. As a result, all users who connect as a database server administrator own and can modify the data in the dbo.
