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MongoDB C100DBA Exam - Topic 8 Question 121 Discussion

Actual exam question for MongoDB's C100DBA exam
Question #: 121
Topic #: 8
[All C100DBA Questions]

What does the following aggregate query perform?

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Suggested Answer: C

by diana loaiza at Nov 24, 2025, 11:08 AM

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Kara
1 month ago
I agree with C. It’s straightforward counting.
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Billye
2 months ago
I’m confused, but B sounds logical for grouping.
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Oliva
2 months ago
D seems tricky, but I lean towards A.
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Clay
2 months ago
C makes sense. It’s about counting posts.
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Ceola
2 months ago
I think it's option C.
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Cassie
2 months ago
I agree with you, Lili. That part is confusing!
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Mendy
2 months ago
Wait, are we sure it sets _id to null? That seems odd.
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Jesus
3 months ago
Definitely option C! Makes the most sense.
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Lili
3 months ago
I think it actually fetches the posts, not just counts them.
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Shanice
3 months ago
It calculates the number of posts with likes between 100 and 200.
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Deonna
4 months ago
I think it fetches posts with likes between 100 and 200, but I'm not clear on the details about the _id and incrementing.
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Brock
4 months ago
I feel like it might be calculating the number of posts, but the options are a bit confusing.
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Sylvie
4 months ago
I remember a similar question where we had to group data by likes, but I can't recall if that's what this one does.
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Blondell
4 months ago
I think this query is about fetching posts with a specific range of likes, but I'm not sure if it sets the _id to null or not.
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Arminda
4 months ago
D) Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time.
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Nguyet
4 months ago
Haha, I bet the correct answer is the one that sounds the most complicated!
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Socorro
5 months ago
C) Calculates the number of posts with likes between 100 and 200.
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Jamal
5 months ago
B) Groups the posts by number of likes (101, 102, 103.) by adding 1 every time.
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Salome
5 months ago
I'm pretty confident that the answer is B. The query is clearly grouping the posts by the number of likes, which is what that option describes.
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Timothy
5 months ago
I'm a bit confused by the wording of the options. Option D seems to be describing something more complex than just a simple grouping. I'll need to re-read the question and options carefully.
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Ashlyn
5 months ago
Okay, let me see. I think option B is the right answer - it's grouping the posts by the number of likes, adding 1 each time. That would give you the count of posts in each likes range.
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Mattie
6 months ago
This question is a real head-scratcher, but I'm going with B. Gotta love those group-by queries!
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Lenita
6 months ago
I feel like it’s B.
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Keena
6 months ago
Hmm, the image shows a group operation, so I'm thinking it's probably grouping the posts by the number of likes. But I'm not sure if it's just counting the number of posts in each group or doing something else.
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Nicholle
6 months ago
This looks like an aggregate query, but I'm not sure exactly what it's doing. I'll need to think through the options carefully.
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Hershel
20 days ago
D seems complicated, I don’t think it’s that one.
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Kara
26 days ago
I’m leaning towards A. It mentions fetching posts specifically.
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Ahmad
1 month ago
But what about grouping? Option B could be it too.
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Daniela
1 month ago
Yeah, option C sounds right to me.
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Carli
5 months ago
I think it’s about counting posts with likes in a range.
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