Aggregation is used to perform complex data search operations in the mongo query which can't be done in normal "find" query.
Create some dummy data:
db.employees.insert({"name":"Adma","dept":"Admin","languages":["german","f...
This is an example code to create and execute the aggregate query in MongoDB using Spring Data.
try {
MongoClient mongo = new MongoClient();
DB db = mongo.getDB("so");
DBCollection coll = db.getCollection("employees");
//Equivalent to $m...
To get random data from certain collection refer to $sample aggregation.
db.emplyees.aggregate({ $sample: { size:1 } })
where size stands for number of items to select.
