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Databricks Certified Data Engineer Professional Exam - Topic 6 Question 39 Discussion

Posted by Sabra on Aug 12, 2025 at 10:48 PM

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?

Suggested 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 Reference: [Databricks Certified Data Engineer Professional], under ''Delta Lake'' section; Databricks Documentation, under ''Write to Delta tables'' section.


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22 comments · newest first
RE
Ressie 9 months ago
E is interesting, but I doubt it’s efficient for large datasets.
YU
Yun 9 months ago
D is what I expected, recalculating all results is key.
JE
Jerrod 10 months ago
Wait, does C really identify unjoined rows? Sounds odd.
BU
Buck 10 months ago
I think B makes more sense, it’s a full overwrite.
AR
Arthur 10 months ago
A is correct, it updates only changed rows!
NA
Nakisha 11 months ago
I feel like option E makes sense since it mentions query materialization, but I can't recall if that's how it works with the enriched table.
FR
Francine 11 months ago
I'm a bit confused about the incremental job concept. Does it really only write unjoined rows, or does it also recalculate everything?
RO
Roosevelt 11 months ago
I think I practiced a question similar to this where the table was completely overwritten. Could it be option B?
AN
Anthony 11 months ago
I remember something about batch jobs updating tables, but I'm not sure if it only updates different rows or if it replaces everything.
LI
Linn 12 months ago
This looks like a pretty straightforward data engineering question. I'm confident I can analyze the code and the question to determine the correct answer.
CA
Candida 12 months ago
The question mentions that the data is de-duplicated and validated, so I don't think I need to worry too much about data quality issues. I'll focus on understanding the code and the different options presented in the answers.
GA
Gail 12 months ago
Okay, the key things I need to look for are the join logic, the target table, and any incremental or update behavior mentioned in the question. I think I can work through this step-by-step.
RO
Roselle 1 year ago
Hmm, the question is asking about the behavior when the code is executed, so I'll need to focus on understanding the logic of the code and how it interacts with the data.
LA
Lakeesha 1 year ago
This looks like a tricky one. I'll need to carefully read through the code and the question to understand what's happening.
ME
Melynda 1 year ago
Hmm, the question mentions that the source data has been validated, so I'm going to go with D. An incremental job to detect new rows and recalculate the results sounds like the way to go.
RO
Rolande 1 year ago
I disagree, I believe the correct answer is D.
CA
Cathrine 1 year ago
This looks like a common data engineering task. I think the correct answer is B, as the code seems to be performing a full overwrite of the target table.
VE
Veda 9 months ago
↳ replying to Cathrine
E could be right too. It waits for a query before doing any computation.
AL
Alecia 9 months ago
↳ replying to Cathrine
I see your point, but I think A makes more sense. It updates only changed rows.
JE
Jesusa 10 months ago
↳ replying to Cathrine
I lean towards D. It sounds like it recalculates everything if new rows are found.
JU
Justa 10 months ago
↳ replying to Cathrine
I still believe B is the best choice. Full overwrite seems logical here.
ME
Mertie 1 year ago
I think the answer is B.
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