Exam C100DEV Topic 1 Question 8 Discussion

Actual exam question for MongoDB's C100DEV exam
Question #: 8
Topic #: 1

Suppose we have database with the following collections: db.users.insertMany([ { _id: 1, user_name: 'karo243', account_id: 1010 }, { _id: 2, user_name: 'jano23', account_id: 3213 }, { _id: 3, user_name: 'fac_data', account_id: 4336 } ]) db.accounts.insertMany([ { account_id: 1010, type: 'investment', limit: 1000000 }, { account_id: 4336, type: 'derivatives', limit: 100000 } ]) We want to perform so-called left join. To the users collection join account details from accounts collection based on account_id field. See below. Expected output: [ { _id: 1, user_name: 'karo243', account_id: 1010, account_details: [ { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 } ] }, { _id: 2, user_name: 'jano23', account_id: 3213, account_details: [] }, { _id: 3, user_name: 'fac_data', account_id: 4336, account_details: [ { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 } ] } ]
Which query do you need to use?

A. db.users.aggregate([ { $lookup: { from: 'accounts', as: 'account_details' } } ]) B. db.users.aggregate([ { $lookup: { from: 'accounts', localField: 'account_id', foreignField: 'account_id' } } ]) C. db.users.aggregate([ { $lookup: { from: 'accounts', localField: 'account_id', foreignField: 'account_id', as: 'account_details' } } ]) D. db.accounts.aggregate([ { $lookup: { from: 'accounts', localField: 'account_id', foreignField: 'account_id', as: 'account_details' } } ])

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