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Exam Certified Data Engineer Professional topic 1 question 27 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 27
Topic #: 1
[All Certified Data Engineer Professional Questions]

A junior data engineer on your team has implemented the following code block.

The view new_events contains a batch of records with the same schema as the events Delta table. The event_id field serves as a unique key for this table.
When this query is executed, what will happen with new records that have the same event_id as an existing record?

  • A. They are merged.
  • B. They are ignored.
  • C. They are updated.
  • D. They are inserted.
  • E. They are deleted.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by rairaix at Sept. 25, 2023, 1:36 a.m.

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alexvno
1 month, 3 weeks ago
Selected Answer: B
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upvoted 1 times
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rairaix
2 months, 2 weeks ago
Selected Answer: B
The answer is correct. "If none of the WHEN MATCHED conditions evaluate to true for a source and target row pair that matches the merge_condition, then the target row is left unchanged." https://docs.databricks.com/en/sql/language-manual/delta-merge-into.html#:~:text=If%20none%20of%20the%20WHEN%20MATCHED%20conditions%20evaluate%20to%20true%20for%20a%20source%20and%20target%20row%20pair%20that%20matches%20the%20merge_condition%2C%20then%20the%20target%20row%20is%20left%20unchanged.
upvoted 3 times
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