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MongoDB MCQs

What is the correct aggregation pipeline to prefix all the values of the 'name' column in the 'test' collection?

db.test.aggregate([{ $project: { $concat: { name: ['prefix', '$name'] } } }]);

db.test.aggregate([{ $project: { name: { $concat: ['prefix', '$name'] } } }]);

db.test.aggregate([{ $group: { name: { 'prefix' + '$name' } } }]);

db.test.aggregate([{ $group: { name: ['prefix', '$name'] } }]);

Answer

Correct Answer: db.test.aggregate([{ $project: { name: { $concat: ['prefix', '$name'] } } }]);

Explanation:

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