The INSERT OVERWRITE command is the optimal choice for the data engineer's objective. It enables the insertion of new data into an existing table while simultaneously overwriting any existing data. This ensures the table exclusively reflects the latest data, making it perfect for scenarios requiring a complete dataset refresh. For example:

INSERT OVERWRITE TABLE existing_delta_table
SELECT * FROM new_data_table;

This example illustrates how INSERT OVERWRITE can efficiently replace all data in existing_delta_table with data from new_data_table, keeping the dataset up-to-date in a single operation.