Exam DP-203 topic 1 question 63 discussion

When applying updates to a Type 2 slowly changing dimension (SCD) table in Azure Databricks, the best option is to use the MERGE operation in Apache Spark SQL. This operation allows you to combine the data from the source table with the data in the destination table, and then update or insert the appropriate r ecords. The MERGE operation provides a powerful and flexible way to handle updates for SCD tables, as it can handle both updates and inserts in a single operation. Additionally, this operation can be performed on Delta Lake tables, which can easily handle the ACID transactions needed for handling SCD updates.

correct D

Correct Answer: D

Type 2 SCD means you have a new row to insert for the changes. The only MERGE supports this operation among the possible answers

MERGE Operation: The MERGE operation in Apache Spark SQL (and specifically in Delta Lake) combines the capabilities of both INSERT and UPDATE. It allows you to upsert data (insert new records or update existing records) based on a specified condition. When you have a slowly changing dimension (SCD) table like Table1, where historical data needs to be maintained. Therefore, the correct answer is D. MERGE

To update or upsert records in a delta lake in Databricks use the "Merge" command.

To update or upsert records in a delta lake in Databricks use the "Merge" command. https://learn.microsoft.com/en-us/azure/databricks/delta/merge

Correct