MongoDB Exam C100DBA Topic 1 Question 83 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 83
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 Fannie at Mar 17, 2024, 09:13 PM

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Brynn

6 months ago

I agree with Cecily. The answer is definitely C) 4

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Cecily

6 months ago

Well, when you $unwind the array in the aggregation, it creates a new document for each element in the array. So with 2 documents and 2 elements in each array, we should have 4 documents.

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