When I look at Enterprise Manager or execute sp_helpdb '<db_name>' for a particular database, the database owner (DBO) appears to be a Windows NT user who hasn't been added to the SQL Server 7.0 server logins. (This NT user is a member of the local NT administrator group.) However, when I execute

USE <db_name>
EXEC sp_helpuser

the result shows that sa maps to the user DBO, which to me means that sa is the DBO. Therefore, the statement