Which of the following scenarios does not require manual database table adjustment?

When a database table is empty and a new field is added, manual adjustment is not necessary because there is no existing data that would be impacted by this change. The addition of a field does not alter the current structure of the table in regards to existing records, since those records are absent. This allows for the new field to be incorporated seamlessly into the database schema without any risk of data loss or inconsistency.

In contrast, scenarios involving modifying a table where data is present can lead to challenges. When a field is added to a table that contains data, there is a need to ensure that default values or constraints are defined for existing entries. Moreover, deleting a field from a populated table risks the integrity of the data stored in that field, necessitating careful handling and possibly manual adjustments to avoid data loss or corruption.

Thus, the condition where the table is empty provides a straightforward context for adding a field without the need for additional measures.