MongoDB
C100DBA · Question #70
C100DBA Question #70: Real Exam Question with Answer & Explanation
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Question
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )
Options
- AAverage of likes on all the posts of an author, grouped by author
- BNumber of posts by an author
- CSum of likes on all the posts by all the authors
- DSum of likes on all the posts by an author, grouped by author
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