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Quiz - MongoDB - 3
Select the right answer for below questions:
What is the difference between a single-field index and a compound index in MongoDB?
A single-field index indexes multiple fields, while a compound index indexes a single field
A single-field index indexes a single field, while a compound index indexes multiple fields
There is no difference between a single-field index and a compound index in MongoDB
A single-field index indexes a single field, while a compound index indexes multiple fields
What is the syntax for creating a single-field index in MongoDB?
db.collection.createSingleIndex({"field": 1})
db.collection.createIndex({"field": 1})
db.collection.createSingleFieldIndex({"field": 1})
db.collection.createIndex({"field": 1})
What is the syntax for creating a compound index in MongoDB?
db.collection.createCompoundIndex({"field1": 1, "field2": -1})
db.collection.createIndex({"field1": 1, "field2": -1})
db.collection.createMultiFieldIndex({"field1": 1, "field2": -1})
db.collection.createIndex({"field1": 1, "field2": -1})
What is the difference between a TTL index and a regular index in MongoDB?
A TTL index automatically expires documents, while a regular index does not
A regular index automatically expires documents, while a TTL index does not
There is no difference between a TTL index and a regular index in MongoDB
A TTL index automatically expires documents, while a regular index does not
What is the aggregation pipeline in MongoDB?
A way to index data in MongoDB
A set of stages that can be used to process data in MongoDB
A way to store data in MongoDB
A set of stages that can be used to process data in MongoDB
What is the syntax for using the aggregation pipeline in MongoDB?
db.collection.aggregate([{ $match: { field: value } }, { $group: { _id: "$field", count: { $sum: 1 } } }])
db.collection.find([{ $match: { field: value } }, { $group: { _id: "$field", count: { $sum: 1 } } }])
db.collection.update([{ $match: { field: value } }, { $group: { _id: "$field", count: { $sum: 1 } } }])
db.collection.aggregate([{ $match: { field: value } }, { $group: { _id: "$field", count: { $sum: 1 } } }])
What is the $project operator in the aggregation pipeline?
A way to filter data in the aggregation pipeline
A way to project fields in the aggregation pipeline
A way to sort data in the aggregation pipeline
A way to project fields in the aggregation pipeline
What is the syntax for using the $project operator in the aggregation pipeline?
{ $sort: { field1: 1, field2: 1 } }
{ $project: { field1: 1, field2: 1 } }
{ $filter: { field1: 1, field2: 1 } }
{ $project: { field1: 1, field2: 1 } }
What is the difference between the $in and $nin operators in MongoDB?
$in matches values that are in an array, while $nin matches values that are not in an array
$nin matches values that are in an array, while $in matches values that are not in an array
$in and $nin are the same operator in MongoDB
$in matches values that are in an array, while $nin matches values that are not in an array
What is the syntax for using the $in operator in MongoDB?
db.collection.find({ field: { $nin: [value1, value2] } })
db.collection.find({ field: { $in: [value1, value2] } })
db.collection.find({ field: { $all: [value1, value2] } })
db.collection.find({ field: { $in: [value1, value2] } })
Submit
Retry
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