Explanation:The index skips documents that do not have the indexed field. 7. MongoDB can use the _________ of indexes to fulfill queries.
A. union
B. intersection
C. projection
D. None of the mentioned
Answer:A
Explanation:The index skips documents that do not have the indexed field. 7. MongoDB can use the _________ of indexes to fulfill queries.
A. union B. intersection C. projection D. None of the mentioned
Explanation:The $project takes a document that can specify the inclusion of fields, the suppression of the _id field, the addition of new fields, and the resetting the values of existing fields. 8. Which of the following method is to verify whether MongoDB used index intersection ?