Exam Certified Data Engineer Professional topic 1 question 152 discussion

Actual exam question from Databricks's Certified Data Engineer Professional

Question #: 152
Topic #: 1

[All Certified Data Engineer Professional Questions]

The data engineering team maintains the following code:

Assuming that this code produces logically correct results and the data in the source tables has been de-duplicated and validated, which statement describes what will occur when this code is executed?

A. A batch job will update the enriched_itemized_orders_by_account table, replacing only those rows that have different values than the current version of the table, using accountID as the primary key.
B. The enriched_itemized_orders_by_account table will be overwritten using the current valid version of data in each of the three tables referenced in the join logic.
C. No computation will occur until enriched_itemized_orders_by_account is queried; upon query materialization, results will be calculated using the current valid version of data in each of the three tables referenced in the join logic.
D. An incremental job will detect if new rows have been written to any of the source tables; if new rows are detected, all results will be recalculated and used to overwrite the enriched_itemized_orders_by_account table.

Show Suggested Answer

Suggested Answer: B 🗳️

by hpkr at June 12, 2024, 6:15 p.m.

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c315d10

2 months, 1 week ago

Selected Answer: B

correct

upvoted 1 times

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KadELbied

3 months ago

Selected Answer: B

This is the correct answer because it describes what will occur when this code is executed. The code uses three Delta Lake tables as input sources: accounts, orders, and order_items. These tables are joined together using SQL queries to create a view called new_enriched_itemized_orders_by_account, which contains information about each order item and its associated account details. Then, the code uses write.format("delta").mode("overwrite") to overwrite a target table called enriched_itemized_orders_by_account using the data from the view. This means that every time this code is executed, it will replace all existing data in the target table with new data based on the current valid version of data in each of the three input tables. Verified References: [Databricks Certified Data Engineer Professional], under "Delta Lake" section; Databricks Documentation, under "Write to Delta tables" section.

upvoted 1 times

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hpkr

1 year, 1 month ago

Selected Answer: B

B is correct

upvoted 3 times

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