MongoDB Exam C100DBA Topic 5 Question 101 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 101
Topic #: 5

Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

Adb.posts.finOne({},{_id:0, post_text:1})

Bdb.posts.findOne({post_text: 1})

Cdb.posts.find({},{_id:Of post_text:1})

Ddb.posts.finOne},{post_text:l})

Show Suggested Answer

Suggested Answer: A

by Galen at Sep 14, 2024, 05:46 PM

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Gwenn

3 months ago

I'm going with option A. It's clear and straightforward, and it does exactly what the question asks for.

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Nguyet

1 months ago

Option A is the best choice for retrieving only the post_text key.

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Jaime

1 months ago

I would go with option A as well.

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Gwenn

1 months ago

I agree, option A seems to be the most accurate choice.

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Zack

2 months ago

I think option A is the correct one.

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Norah

3 months ago

Haha, option D is just a mess. 'finOne}' instead of 'findOne()' and 'post_text:l' instead of 'post_text:1'. Rookie mistake!

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Florinda

1 months ago

C) db.posts.find({},{_id:Of post_text:1})

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Shelba

2 months ago

B) db.posts.findOne({post_text: 1})

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Margarita

2 months ago

A) db.posts.finOne({},{_id:0, post_text:1})

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Charolette

3 months ago

I think option C is the correct one. It's the only one that explicitly says 'post_text:1' to retrieve just that field.

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Valene

3 months ago

Option A looks good, it retrieves only the post_text field from the first document.

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Lashon

2 months ago

User 3: I'm also leaning towards option A, it seems to be the most accurate choice.

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France

2 months ago

Yes, I agree. Option A looks good for that.

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An

3 months ago

I think option A is the correct query to retrieve only the post_text field.

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Kanisha

3 months ago

I'm not sure, but I think it's C because we need to exclude the _id field.

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Tracey

3 months ago

I disagree, I believe the correct answer is B.

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Amie

4 months ago

I think the answer is A.

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