MongoDB Exam C100DBA Topic 1 Question 109 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 109
Topic #: 1

[All C100DBA Questions]

Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

Which of the following commands will find all the posts that have been tagged as tutorial.

Adb.posts.find( { tags : ['tutorial'] } );

Bdb.posts.find( { $array : {tags: 'tutorial') > );

Cdb.posts.find( { tags : 'tutorial' } );

Ddb.posts.findInArray( { tags : 'tutorial' > );

Show Suggested Answer

Suggested Answer: C

by Joaquin at Mar 22, 2025, 05:15 AM

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Glendora

24 days ago

Wait, 'tutorial' is a tag, not a tutorial. This test is testing my sanity, not my MongoDB skills.

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Cyndy

10 days ago

A) db.posts.find( { tags : [\'tutorial\'] } );

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Gerald

25 days ago

B) db.posts.find( { $array : {tags: tutorial}) > is just plain weird. What is this, JavaScript land? I'll stick with good old C).

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Gilma

26 days ago

I think D is definitely wrong, it doesn't look like a valid command.

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Stefanie

29 days ago

I'm not sure, but C could also be a possibility.

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Lorita

29 days ago

D) db.posts.findInArray( { tags : tutorial > ); sounds like it should work, but I've never heard of that command. Is that some secret MongoDB technique?

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Luis

1 months ago

A) db.posts.find( { tags : [tutorial] } ); is the way to go. Gotta love that array matching!

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Lashon

2 days ago

User2: Thanks for the clarification, I'll keep that in mind for future queries.

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Jennie

5 days ago

User3: User1 is right, A) is the correct command for finding posts with the 'tutorial' tag.

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Talia

8 days ago

User2: C) db.posts.find( { tags : 'tutorial' } ); is also a valid option.

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Timothy

11 days ago

User1: A) db.posts.find( { tags : [tutorial] } ); is the way to go. Gotta love that array matching!

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Corrie

1 months ago

I agree with Thea, A seems correct.

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Mindy

1 months ago

C) db.posts.find( { tags : tutorial } ); is the correct answer. It's a simple and straightforward way to query for posts with the 'tutorial' tag.

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Kassandra

6 days ago

Great, thanks for clarifying!

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Veronika

7 days ago

C) db.posts.find( { tags : \'tutorial\' } ); is the correct answer.

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Stephane

9 days ago

A) db.posts.find( { tags : [\'tutorial\'] } );

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Thea

1 months ago

I think the answer is A.

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