MongoDB Exam C100DBA Topic 8 Question 104 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 104
Topic #: 8

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?

Show Suggested Answer

Suggested Answer: B

by Lynelle at Dec 05, 2024, 06:19 AM

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Joseph

3 days ago

Hmm, I think the answer is D) 2. The unwind operation shouldn't create any new documents, it should just flatten the 'traits' array within each of the original 2 documents.

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Emily

5 days ago

I disagree, I believe the answer is A) 3.

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Gertude

11 days ago

I'm pretty sure the answer is B) 5. The unwind operation should create 5 documents, one for each element in the 'traits' array across the 2 original documents.

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Asha

16 days ago

The answer is clearly C) 4. The unwind operation will split each document into individual elements of the 'traits' array, so the original 2 documents will become 4 documents.

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Elliott

3 days ago

I think the answer is A) 3.

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Paris

21 days ago

I think the answer is C) 4.

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