MongoDB Exam C100DBA Topic 1 Question 85 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 85
Topic #: 1

Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

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Suggested Answer: B

by Dottie at Apr 22, 2024, 02:49 AM

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Giovanna

7 months ago

I agree with the answer is 4. Each document in the collection will be duplicated for every element in the 'traits' array, resulting in 4 documents in total.

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Venita

7 months ago

I'm not sure, but I think the answer is 2. The $unwind stage will create a document for each element in the 'traits' array, resulting in a total of 2 documents.

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Luis

8 months ago

I disagree, I believe the answer is 4. The $unwind stage will create a document for each element in the 'traits' array but it will maintain the original document as well.

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