$match and $group Aggregation Stages - MongoDB Aggregation Tutorial For Beginner

After introduction of group stage let's combine $match and $group stages. So direct jump to example using our person collection. db.getCollection("person").aggregate([ {$match:{country:"China"}}, // stage 1 {$group:{_id:{age:"$age", gender:"$gender",}}} // stage 2 ]); In above example first we use match stage where we find all document whose country is china and next group stage and finally we will get documents with ...

$group Aggregation Stages - MongoDB Aggregation Tutorial For Beginner

In Last tutorial we have seen $match stage now we will see how $group stage works so let's begin. $group stage is very important stage of aggregation because it is use often in aggregation query. Groups documents by some specified expression and outputs to the next stage a document for each distinct grouping. Let's look in to syntax. $group Aggregation Stages Syntax { $group: { _id: <expression>, <field1>: { <accumulator1>...

$match Aggregation Stages - MongoDB Aggregation Tutorial For Beginner

Now let's talk about mongodb Aggregation stages and first stage will $match stage. We already familiar with mongodb query. Match Stages use query as argument and same as find method so its easy to learn. $match aggregation stages syntax { $match: { <query> }} $match example {$match:{country:"Poland"}} {$match:{age:{$gt:"20"}}} So first example query looking for all document whose city is Poland and second example age greater...

Aggregation Stages - MongoDB Aggregation Tutorial for beginner

In Last tutorial we have seen basic concept of mongodb aggregation. In this tutorial we gonna take tour of mongodb aggregation stages. For this whole tutorials series i am gonna use ROBO 3T to execute mongodb query. you can download ROBO 3T software from this website https://robomongo.org/ and download database from this google drive link. Mongodb Aggregation without any stages In Previous blog we have seen syntax of mongodb aggregate...

Introduction to the Aggregation Framework - MongoDB Aggregation Tutorial for beginner

Hello guy's Today we are gonna talk about mongoDB Aggregation framework. It is most powerful tool that mongodb offers us. Using aggregation framework we can group document by using specific condition. We can also add more fields during group such as Avg, Min, Max and so on. We can process collection document's in several stages one by one. Aggregation process is very fast so aggregation query respond very fast. Aggregations operations...