MongoDB Exam C100DBA Topic 6 Question 96 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 96
Topic #: 6

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 Salena at Sep 11, 2024, 04:49 AM

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Sylvie

3 months ago

I agree with Mona, I also think the answer is C) 4 because each document will be duplicated for each element in the 'traits' array.

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Mona

3 months ago

But if there are only 2 documents and we unwind the 'traits' field, wouldn't it create 4 documents?

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Alright, time to put on my thinking cap. I reckon the answer is B) 5. Unwinding that 'traits' array is gonna split each of the 2 documents into 5 separate ones. *winks* Gotta love these aggregation queries, am I right?

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Isadora

3 months ago

Ha, this is like a trick question! The answer's gotta be E) 1. I mean, come on, if you unwind the 'traits' field, you're basically flattening the whole collection into a single document. Easy money, folks!

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Skye

2 months ago

Yeah, I agree. Unwinding the 'traits' field will collapse the documents into one.

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Karan

2 months ago

I think you're right, E) 1 seems like the correct answer.

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Major

3 months ago

Oof, this one's a real brain-buster. I'm gonna have to go with D) 2 on this one. Unwinding the 'traits' array should keep the original document count, right? *scratches head* Hmm, maybe I should've paid more attention in class...

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Ming

3 months ago

This one's tricky, but I think the correct answer is C) 4. The question states there are only 2 documents, and when you unwind the 'traits' field, each document will be split into 2 separate documents. Easy peasy!

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Tish

3 months ago

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

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Emilio

3 months ago

Hmm, let's see... Unwinding the 'traits' field should create a new document for each element in the array, so I'd say the answer is B) 5. Boom, nailed it!

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Chan

3 months ago

No, I'm pretty sure it's B) 5 because each element in the 'traits' array will create a new document.

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Ashton

3 months ago

I think it's actually C) 4, because there are 2 documents and each document has 2 elements in the 'traits' array.

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Mona

3 months ago

I think the answer is C) 4.

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MongoDB Exam C100DBA Topic 6 Question 96 Discussion

Contribute your Thoughts:

Sylvie

Mona

Dominga

Isadora

Skye

Karan

Major

Ming

Tish

Emilio

Chan

Ashton

Mona