C100DBA · Question #69
Below is a sample document of "orders" collection
The correct answer is A. $project. $project is correct because it is the MongoDB aggregation pipeline stage used to reshape documents - allowing you to include, exclude, rename, or compute new fields from source documents like those in an "orders" collection. It acts as a field selector and transformer, giving you
Question
Below is a sample document of "orders" collection
Exhibit
Options
- A$project
How the community answered
(36 responses)- A100% (36)
Explanation
$project is correct because it is the MongoDB aggregation pipeline stage used to reshape documents - allowing you to include, exclude, rename, or compute new fields from source documents like those in an "orders" collection. It acts as a field selector and transformer, giving you precise control over what appears in the output documents.
Without seeing the other choices, I can speak to common distractors in this category: $match is wrong if selected because it filters documents by condition rather than reshaping them; $group is wrong because it aggregates documents together (e.g., summing totals), not selects fields; $sort is wrong because it only orders documents; and $unwind is wrong because it deconstructs array fields into separate documents.
Memory tip: Think of $project like the SELECT clause in SQL - just as SELECT name, price FROM orders picks which columns appear, $project: { name: 1, price: 1 } picks which fields appear in your MongoDB pipeline output.
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