Which of the following commands can be used to write data into a Delta table while avoiding the writing of duplicate records?

Which of the following commands can be used to write data into a Delta table while avoiding the writing of duplicate records?
A . DROP
B . IGNORE
C . MERGE
D . APPEND
E . INSERT

View Answer

Answer: C

Explanation:

To write data into a Delta table while avoiding the writing of duplicate records, you can use the MERGE command. The MERGE command in Delta Lake allows you to combine the ability to insert new records and update existing records in a single atomic operation. The MERGE command compares the data being written with the existing data in the Delta table based on specified matching criteria, typically using a primary key or unique identifier. It then performs conditional actions, such as inserting new records or updating existing records, depending on the comparison results. By using the MERGE command, you can handle the prevention of duplicate records in a more controlled and efficient manner. It allows you to synchronize and reconcile data from different sources while avoiding duplication and ensuring data integrity.