What is the correct command to ensure a Delta table reads all existing rows in addition to newly added ones?

What is the correct command to ensure a Delta table reads all existing rows in addition to newly added ones?

• A. write
• B. update
• C. append
• D. add

Answer: (C)

The command that ensures a Delta table reads all existing rows as well as newly added ones is the append command. When using this command, the system is instructed to add new data to the existing data set while retaining all previously stored records. In Delta tables, which are designed for handling large volumes of data efficiently, it is crucial to maintain all existing rows when incorporating new data. The append action is specifically designed for this purpose—adding new records without overriding or excluding any of the existing information. Thus, when a Delta table is queried after an append operation, users will see the complete dataset, inclusive of both historical and newly inserted records.

The command that ensures a Delta table reads all existing rows as well as newly added ones is the append command. When using this command, the system is instructed to add new data to the existing data set while retaining all previously stored records. In Delta tables, which are designed for handling large volumes of data efficiently, it is crucial to maintain all existing rows when incorporating new data.

The append action is specifically designed for this purpose—adding new records without overriding or excluding any of the existing information. Thus, when a Delta table is queried after an append operation, users will see the complete dataset, inclusive of both historical and newly inserted records.