Explanation:Query uses the projection { “history”: 0 } to exclude the history field from the documents in the result set. 8. Which of the following functionality is used for aggregation framework ?
A. $match
B. $project
C. $projectmatch
D. All of the mentioned
Answer:A
Explanation:Query uses the projection { “history”: 0 } to exclude the history field from the documents in the result set. 8. Which of the following functionality is used for aggregation framework ?
A. $match B. $project C. $projectmatch D. All of the mentioned