1. jsMode
2. scope
3. finalize
4. min
jsMode
1. $unwindelem
2. $unwind
3. $unwin
4. None of the mentioned
$unwin
1. Variables can hold any BSON type data
2. Aggregation expressions can use both user-defined and system variables
3. To access the value of the variable, use a string with the variable name prefixed with double dollar signs ($$)
4. None of the mentioned
To access the value of the variable, use a string with the variable name prefixed with double dollar signs ($$)
1. Aggregation pipeline have some limitations on value types and result size
2. The aggregation pipeline is a framework for data aggregation modeled on the concept of data processing pipelines
3. Documents enter a multi-stage pipeline that transforms the documents into an aggregated results
4. All of the mentioned
All of the mentioned
1. mongo
2. master
3. test
4. primary
test
1. mongo.js
2. mongoc.js
3. mongorc.js
4. all of the mentioned
mongorc.js
1. Queries specify criteria, or conditions, that identify the documents that MongoDB returns to the clients
2. Write operations, or queries, retrieve data stored in the database
3. The selection limits the amount of data that MongoDB returns to the client over the network
4. All of the mentioned
Queries specify criteria, or conditions, that identify the documents that MongoDB returns to the clients
1. $match
2. $project
3. $projectmatch
4. All of the mentioned
$project
1. findOne()
2. findOne1()
3. selectOne()
4. all of the mentioned
findOne()
1. read
2. write
3. update
4. delete
read