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MongoDB.C100DEV.v2023-06-07.q92
Question 56

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Question 56/92

In your database there is a collection named companies with the following document structure: { name: 'Wize', relationships: [ { is_past: false, title: 'Head of Product', person: { first_name: 'Ethan', last_name: 'Smith', permalink: 'ethan-smith' } }, { is_past: true, title: 'Director, Business Development', person: { first_name: 'Stephanie', last_name: 'Quay', permalink: 'stephanie-quay' } }, { is_past: true, title: 'Sr. Engineer', person: { first_name: 'Stefan', last_name: 'Antonowicz', permalink: 'stefan-antonowicz' } } ] } Which of the following queries should you use to extract all companies that have "Co-Founder" title in relationships field (Array)?

A. db.companies.find( { relationships: { $eq: { title: 'Co-Founder' } } } )

B. db.companies.find( { relationships: { $match: { title: 'Co-Founder' } } } )

C. db.companies.find( { relationships: { $elemMatch: { title: 'Co-Founder' } } } )

Correct Answer: C

https://docs.mongodb.com/manual/reference/operator/query/elemMatch/

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