Mongodb Aggregate

Note: I use the aggregation framework for basic document filtering. Because of the clean and light user interface, you can execute the typical MongoDB commands fast and effective, without using the MongoDB shell. In mongoDB 2. Download it once and read it on your Kindle device, PC, phones or tablets. Video created by MongoDB Inc. We're using MongoDB's aggregation framework for our data analysis and one thing we are frequently doing is slicing data by date parts, such as months, days, weeks, etc, for further aggregation and analysis. Buy at this store. MongoDB Aggregation Query: Getting All Records having Max Value By Brij Mohan In this post, we will write a query using MongoDB aggregate method to get all records having Max (Highest) value for specific field. Ensuring all operations run in memory, given 1. NET driver using loosely typed BsonDocument objects and the AppendStage function. Documents enter a multi-stage pipeline that transforms the documents into aggregated results. Posted in JavaScript, MongoDB, Programming by rubayeet Prior to version 2. Still this time I have something thing to share. var connectionstring = "mongodb://localhost:27017"; var. does aggregation works with spring data mongodb in fields of nested array using DBREF? I tried first aggregation of mongodb shell and I find that it does not work with references Vote Up 0 Vote Down Reply. mongoengine. In this case, 36 documents match the query "property. The latest Tweets from MongoDB (@MongoDB). In this chapter, we are going to explore the 'aggregate' method to operate on the documents present inside a collection of MongoDB. MongoDB Aggregation pipeline is a framework for data aggregation. …To set up for this challenge, I'm using the database…we created for the first problem. Then we will show how to. Aggregation Pipeline. Aggregate data from MongoDB with Node. To post to this group, send email to [email protected] To unsubscribe from this group, send email to mongodb-user+ [email protected] See also. Mongodb Aggregate Example Tutorial. aggregate() method in the mongo shell and the aggregate command to run the aggregation pipeline. The function ends by running MongoDB’s aggregate() function with the modified pipeline, against the subset of matching data. Mongodb Aggregate Match Date Description. GitHub Gist: instantly share code, notes, and snippets. This separation of concerns allows the driver to focus on essential features for which an extension implementation is paramount for performance. It provides drivers in a lot of popular languages such as C, C++, C#, Java, Perl, PHP, Python, Scala and so on. You can then use the. We could also group by using more attributes. Map Reduce. MongoDB is a form of NoSQL database, enabling the storage of data in non-relational forms. These pipelines process data by passing documents through a series of stages that filter, group, sort, transform, or perform operations on the data. The MongoDB database contains a mechanism called the MongoDB aggregation framework. MongoDB Introduce a big change in 2. Specify the name of each field to add and set its value to an aggregation expression. 4 (i think) MongoDB has now a new aggregation pipeline operator named 'facet' which in their own words: Processes multiple aggregation pipelines within a single stage on the same set of input documents. Running the same query on 2. In MongoDB, the aggregation pipeline enables developers to create more sophisticated queries and manipulate data by combining multiple aggregation 'stages' together, thus enabling them to do more data processing on the server side before the results get returned to the client. 6 or later, you must upgrade your mongod servers first before your mongos routers or aggregation queries will fail. Aggregation Framework in MongoDB is developed on the concept of data processing pipelines. Join GitHub today. Let's say we have two collections "likes" and "books" A "like" consists of a userId and a bookId If you want to find. I would like a non-root client to get server time. To query data from MongoDB collection, you need to use MongoDB's find() method. Download it once and read it on your Kindle device, PC, phones or tablets. MongoDB - Aggregation Aggregations operations process data records and return computed results. by ycflame @ ycflame 0. You will have to break things up into two queries from your application code. Pipeline stages can use _____ for tasks such as calculating the average or concatenating a string. Effectively, it allows developers to perform advanced data analysis on MongoDB data. What's more, the aggregation pipeline just got easier to use with MongoDB 4. 文档:MongoDB 官方 aggregate 说明。 相关使用: db. In order to perform the aggregate function in MongoDB, aggregate is the function to be used. While MapReduce is powerful, it is often more difficult than necessary for many simple aggregation tasks, such as totaling or averaging field values. The course is designed for beginners to MongoDB and database, and will introduce common. the top-level document, currently being processed in the aggregation pipeline stage. To perform aggregation, pass a list of aggregation stages to the MongoCollection. Using it can relieve the compute load on your application. 6 version, the aggregation result was a BSON document. That means documents are sent through a multi-step pipeline, filtering, grouping. aggregate() method. The aggregate part of the query seems to work fine, but when I add the distinct I get an empty result. MongoDB: How to aggregate the lengths of nested arrays Posted on April 7, 2013 by badc0da Lets say you have collection (mycollection) that has an embedded object (tags) which happens to be an array. MongoDB documents are limited to 16MB, and prior to the 2. Changed in version 3. MongoDB is a scalable NoSQL document-oriented data store with built-in geo-spatial indexing. VLOG Thursday 144: NordVPN Follow up and do you need a VPN? Doh? DNS TLS? And Security Talk. If you want to learn more about the aggregation framework you can sign up for the free MongoDB University, M121: The MongoDB Aggregation Framework. In MongoDB, a document is a big JSON blob with no particular format or schema. The MongoDB aggregation pipeline is a framework for data aggregation modeled on the concept of data processing pipelines. MongoDB Analytics: Learn Aggregation by Example - Exploratory Analytics and Visualization Using Flight Data June 25, 2014 MongoDB is quickly becoming one of the most common data stores in the enterprise and the aggregation framework is a great way to build analytics on MongoDB. The following aggregation operation looks at the in_stock array in each document and determines whether the string bananas is present. • In the function, this refers to the document that the map-reduce operation is processing. MongoDB - Delete Document; MongoDB - Projection; MongoDB - Limiting Records; MongoDB - Sorting Records; MongoDB - Indexing; MongoDB - Aggregation; MongoDB - Replication; MongoDB - Sharding; MongoDB - Create Backup; MongoDB - Deployment; MongoDB - Java; MongoDB - PHP; Advanced MongoDB; MongoDB - Relationships; MongoDB - Database References. MongoDB - Aggregation Advertisements Previous Page Next Page Aggregations operations process data records and return computed results. The collection is not visible until the aggregation completes. Aggregation Examples¶. About the Author - Andrew Morgan. Aggregation basically groups the data from multiple documents and operates in many ways on those. Like find() you can generate an explain plan for an aggregation to view a more detail execution plan. aggregate() — MongoDB Manual. MongoDB Aggregate Exercise2 - Free download as Word Doc (. MongoDB is an open-source document database and leading NoSQL database. MongoDB $lookup aggregation example. Returns: bucket. In MongoDB, the aggregation pipeline enables developers to create more sophisticated queries and manipulate data by combining multiple aggregation 'stages' together, thus enabling them to do more data processing on the server side before the results get returned to the client. Failed to load latest commit information. MongoDB’s Aggregation Framework has many operators that give you the ability to get more value out of your data, discover usage patterns within your data, or use the Aggregation Framework to power. this we will do with the help of db. aggregate([array]); array可是是任何一个或多个操作符。 group和match的用法,使用过sqlserver,group的用法很好理解,根据指定列进行分组统计,可以统计分组的数量,也能统计分组中的和或者平均值等。. 4, by default, PyMongo's aggregate method returns a single document. In MongoDB, the aggregation pipeline enables developers to create more sophisticated queries and manipulate data by combining multiple aggregation ‘stages’ together, thus enabling them to do more data processing on the server side before the results get returned to the client. Changed in version 2. The first step to this process is learning about MongoDB aggregation. 2 Aggregation Framework is a powerful mechanism that can help you answer questions across documents. In this pipeline, a set of various functions are applied on a document which is entered in the pipeline to aggregate the final result. Previously the aggregations required the usage of map/reduce, which in MongoDB doesn’t perform that well, mainly because of the single-threaded Javascript-based execution. In this session, we walk through indexing & aggregation in MongoDB. 497s - MySQL is 3. In mongoDB 2. Learn the pros and cons of MongoDB. aggregate(pipeline), with a call to my new function aggregate_facets_in_parallel(collection, pipeline), instead. Prerequisites: We highly recommend taking M001 and M101 or 3-6 months experience using MongoDB in application development. log('The length of returned results were: '+d. MongoDB $lookup aggregation example. for the course "MongoDB Aggregation Framework". group(): Group Performs simple aggregation operations on a collection documents. Агрегация и группировка результатов выборки из базы данных MongoDB в C#. Installation. Single-purpose aggregate methods and commands. Photo by Ghost Presenter from Pexels. Top 1% !. They help us analyse the data stored in the database so that understand things like long term business trends, user and customer behaviour, which part of our business is making losses and similar. Alibaba Cloud will support MongoDB features including aggregation pipeline type conversions, extensions to change streams and faster. It provides drivers in a lot of popular languages such as C, C++, C#, Java, Perl, PHP, Python, Scala and so on. MongoDB’s aggregation framework is modeled on the concept of data processing pipelines. outCollectionName - collection name to export aggregation results. 2, if the client that issued the db. mongoDB Many-to-Many Relationship Data Modeling Introduction Implementing a many-to-many relationship in a relational database is not as straight forward as a one-to-many relationship because there is no single command to accomplish it. In this part of the MongoDB tutorial you will learn the aggregation process in MongoDB for recording data and providing computation outcome, performing various operations, what is the pipeline concept in MongoDB and more. So what is Aggregation :- In one liner we can say Aggregation performs operations on documents and provide the computed result. Download it once and read it on your Kindle device, PC, phones or tablets. I am trying to display/list data after using aggregation function but it isn't happening. MongoDB中用户的角色说明read数据库的只读权限,包括:aggregate,checkShardingIndex,cloneCollectionAsCapped,collStats,count, 博文 来自: 一只烦恼的猪 最近在学习Nodejs,在网页端往 MongoDB 插入数据时出现如下错误,如何解决呢?. The aggregate part of the query seems to work fine, but when I add the distinct I get an empty result. This quickstart demonstrates how to use an existing MongoDB app written in Node. Missing Field¶ If you specify a path for a field that does not exist in an input document or the field is an empty array, $unwind, by default, ignores the input. We will use MongoDB to return to us, the total number of products that each manufacturer has in our database. In this module you'll learn the fundamentals of MongoDB's Aggregation Framework. This will cover basics like filtering and sorting, as well as how to transform array. which show below. MongoDB Aggregation Framework way for "select count (distinct fieldName) from someTable" for large collections - gist:3241616. MongoDB also supports same concept in aggregation framework. The final example of this series is available for download. aggregate() — MongoDB Manual. There are several methods of performing aggregations in MongoDB. Mongodb Training in Bangalore, BTM - My Training Bangalore offers Best Mongodb Training with Expert Real-time Mongodb Trainers who have 8+ Years of Expertise, Know more about Mongodb Details, Syllabus, Duration and Fees, we also provide placement assistance on successful completion of the Course. Aggregation. The aggregate part of the query seems to work fine, but when I add the distinct I get an empty result. out of the group selected. Perform Aggregation. MongoDB documents are limited to 16MB, and prior to the 2. 6 removes the use of aggregate command without the cursor option unless the command includes the explain option. The MongoDB $match operator filters the documents to pass only those documents that match the specified condition(s) to the next pipeline stage. This code works absolutely fine. In simple words, MongoDB Aggregation has replaced the MongoDB Map/Reduce feature from v2. 4 and the MongoDB Java Driver 3. MongoDB Aggregation Pipeline for Business Intelligence Simply put, MongoDB's aggregation pipeline is a framework to perform a series of data transformations on a dataset. 1 introduced the aggregation framework , a faster alternative to Map/Reduce for common aggregation operations. MongoDB Aggregation manual; MongoDB sort manual; MongoDB - Aggregate and Group example; aggregate count group mongodb. com - List of all courses that I teach including FREE courses. The OutOperation creates a new collection in the current database if one does not already exist. Get Compass 1. Mongodb Aggregate Match Date Description. Vlad had the courtesy. The find() Method. MongoDB's aggregation framework is modeled on the concept of data processing pipelines. Tailable cursors are only for use with capped collections. Is this because I have state in the id? Can I do something like distinct("_id. aggregate() method. _____ references the root document, i. - groupby_count_aggregation. Read more about the Aggregation Editor, Studio 3T’s stage-by-stage MongoDB aggregation query builder. To use an index, these stages must be the first stages in the pipeline. 1,"Exporting CSV from MongoDB" mongodb csv mongoexport Free 30 Day Trial A look at MongoDB CSV exporting makes up the first part of our Comma Values series, all about the rarely loved CSV files and the databases that import/export them. The $out operator must be the last stage in the pipeline. In the following example, the aggregation pipeline. The MongoDB » aggregation framework provides a means to calculate aggregated values without having to use MapReduce. py Explore Channels Plugins & Tools Pro Login About Us. Taking a look at MongoDB 3. Java Project Tutorial - Make Login and Register Form Step by Step Using NetBeans And MySQL Database - Duration: 3:43:32. In the following example, the aggregation pipeline. Failed to load latest commit information. 1, if you wanted to do aggregation in MongoDB (grouping documents by key(s), finding total and average values etc. 4 and the MongoDB Java Driver 3. Video created by MongoDB Inc. killOp on the operation). MongoEngine is a Document-Object Mapper (think ORM, but for document databases) for working with MongoDB from Python. This is the second part of the tutorial on how to use NodeJS with MongoDB. MongoDB’s Aggregation Framework. mongodb group values by multiple fields. Java Project Tutorial - Make Login and Register Form Step by Step Using NetBeans And MySQL Database - Duration: 3:43:32. In the meantime, here is my ObjectId casting workaround, along with dynamic pipeline creation. While the $match stage does allow references to DBRef fields (i. MongoDB Aggregation Queries for "Counts Per Day" (Part 1) - DZone Database / Database Zone. The aim of this post is to show examples of running the MongoDB Aggregation Framework with the official MongoDB C# drivers. MongoDB’s aggregation framework is a powerful tool that allows you to query your database through multi-stage pipelines. The data we will be using in this example is a collection of products, that has a field product_manufacturer. Ask Question Asked 11 months ago. literally, It's treated as a preferable method to overcoming on-board complexities. In this module you'll learn the fundamentals of MongoDB's Aggregation Framework. The MongoDB 2. To use an index, these stages must be the first stages in the pipeline. Photo by Ghost Presenter from Pexels. Alibaba Cloud will support MongoDB features including aggregation pipeline type conversions, extensions to change streams and faster. We often hear from customers who are unaware of the aggregation framework, or unsure exactly why they should be using it. aggregate() method. MongoDB is best known for creating a document database that Web and mobile developers love to use. rating is at least 7 genres does not contain "Crime" or "Horror" rated is either "PG" or "G" languages. …I'll start up the Mongo shell and we can get to work. 4 (i think) MongoDB has now a new aggregation pipeline operator named 'facet' which in their own words: Processes multiple aggregation pipelines within a single stage on the same set of input documents. Robo 3T (formerly Robomongo) is the free, lightweight, open-source MongoDB GUI with an embedded mongo shell, real auto-completion, and support for MongoDB 4. Specify the name of each field to add and set its value to an aggregation expression. The $out operator must be the last stage in the pipeline. 000 random documents, using an index MySQL scores 0. Documents enter a multi-stage pipeline that transforms the documents. Single-purpose aggregate methods and commands. Must not be null. The final example of this series is available for download. MongoDB Analytics: Learn Aggregation by Example - Exploratory Analytics and Visualization Using Flight Data June 25, 2014 MongoDB is quickly becoming one of the most common data stores in the enterprise and the aggregation framework is a great way to build analytics on MongoDB. To perform aggregation, pass a list of aggregation stages to the MongoCollection. Before Aggregation framework MongoDB used Map/Reduce for such type of operations. Documents enter a multi-stage pipeline that transforms the documents into aggregated results. Example ¶ Changed in version 3. In response to demands for simpler data access, MongoDB is introducing the Aggregation Framework. Definition ¶. MongoDB 聚合 MongoDB中聚合(aggregate)主要用于处理数据(诸如统计平均值,求和等),并返回计算后的数据结果。有点类似sql语句中的 count(*)。. aggregate() method. Perform Aggregation. In other words, MongoDB lets you select fields and group together documents based on your selection in order to find duplicate documents. Background. Photo by Ghost Presenter from Pexels. This may be the existing fields from the. mongodb group() vs mapreduce vs aggregation framework The group() command, Aggregation Framework and MapReduce are collectively aggregation features of MongoDB. If you've heard about MongoDB and want to know more or are planning a MongoDB project and need to get a quick start, this is the course for you. In the meantime, here is my ObjectId casting workaround, along with dynamic pipeline creation. We provide a “template” as a high-level abstraction for storing and querying documents. killOp on the operation). So I figured the best way to estimate the cost of such queries would be to run them and inquire as to their cost. For this tutorial, we will walk through setting up and using the Python MongoDB driver, called PyMongo. MongoDB Aggregation Query: Getting All Records having Max Value By Brij Mohan In this post, we will write a query using MongoDB aggregate method to get all records having Max (Highest) value for specific field. A new asynchronous API that can leverage either Netty or Java 7's AsynchronousSocketChannel for fast and non-blocking IO. A clear benefit of using the MongoDB API is that your solution could run in both database engines, MongoDB or Azure Cosmos DB, so migrations to different environments should be easy. for the course "MongoDB Aggregation Framework". collection_name. Atomic modifiers in MongoDB can only work against a single document. for the course "MongoDB Aggregation Framework". With MongoDB’s Aggregation Pipeline, we don’t have to do that, we can simply create a stage for each step we noted. 1, if you wanted to do aggregation in MongoDB (grouping documents by key(s), finding total and average values etc. 2 for aggregations:. In this module you'll learn the fundamentals of MongoDB's Aggregation Framework. This course will teach you how to perform data analysis using MongoDB's powerful Aggregation Framework. A simple C# script to demo MongoDB aggregation performing group by count. MongoDB is best known for creating a document database that Web and mobile developers love to use. The MongoDB Driver and Async Driver are both built on top of a new core library, which anyone can use to build alternative or experimental high-level APIs. As a reminder here's the structure of a zipcode document:. b) When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys c) Both 2 and 4 are returned by mongod if there is a mismatch between hostnames specified on the command line and in the local. The aim of this post is to show examples of running the MongoDB Aggregation Framework with the official MongoDB C# drivers. 14, including the aggregation pipeline builder, was released for general availability on June 26, 2018. Map-reduce can be used for batch processing of data and aggregation operations. MongoDB aggregation. You should provide a description to describe why this works as a solution for the question. Mongodb Aggregate Match Date. Another good question is why we are using arrays to model days, hours and minutes information, instead of using dedicated JSON property for each element. Add "executionStats" and "allPlansExecution" explain modes to aggregation explain aggregation explain to report the appropriate information in "executionStats. “With aggregation pipelines, documents in a collection pass through multiple stages where they are processed into a set of aggregated results,” the company says. org - there is currently a tutorial, a user guide and API reference. To query data from MongoDB collection, you need to use MongoDB's find() method. rating is at least 7 genres does not contain "Crime" or "Horror" rated is either "PG" or "G" languages. Some drivers also produce Aggregation expressions, such as C# Linq etc. 本站所转载内容,只为给中国网友提供解决方案!如本网站转载稿件涉及版权、著作权等问题,请您来函与本站管理员取得联系,友情链接请加qq,要求pr 或者 br >=2(联系方式:qq 2450057300). MongoDB aggregation framework is designed for grouping documents and transforming them into an aggregated result. We could also group by using more attributes. for the course "MongoDB Aggregation Framework". Translate MongoDB queries (find, aggregate or SQL query) to various target languages: MongoDB Shell, JavaScript (Node. Mongodb Aggregate Example Tutorial. MongoDB provides the db. MongoDB's aggregation framework is a powerful tool that allows you to query your database through multi-stage pipelines. MongoDB aggregation. In the following example, the aggregation pipeline. But according to MongoDB's documentation, the Aggregation Pipeline provides better performance for most. The course is designed for beginners to MongoDB and database, and will introduce common. In this post you will learn how to write flexible MongoDB Aggregation Queries in SSIS (i. MongoDB documents are limited to 16MB, and prior to the 2. MongoDB for #GIANTideas. 물론 이 부분도 앞에서 설명했었던 CRUD처럼 각각의 모든 함수의 사용법을 열거하지 않을 것이다. for the course "MongoDB Aggregation Framework". this we will do with the help of db. a) Aggregation pipeline have some limitations on value types and result size b) The aggregation pipeline is a framework for data aggregation modeled on the concept of data processing pipelines c) Documents enter a multi-stage pipeline that transforms the documents into an aggregated results d) All of the mentioned View Answer. In other words, MongoDB lets you select fields and group together documents based on your selection in order to find duplicate documents. First, we need to extract all documents from the post collection which have the correct. The MongoDB aggregate query is passed an array of pipeline operators which define each operation in order. I tried the below statement and it. Perform Aggregation. MongoDB – group, count and sort example. Map Reduce. MongoDB Aggregation with C# MongoDB is a very praticle and simple NoSQL database. Because of the clean and light user interface, you can execute the typical MongoDB commands fast and effective, without using the MongoDB shell. The Fundamentals of MongoDB Aggregation In this module you'll learn the fundamentals of MongoDB's Aggregation Framework. In it, I cover everything from installing MongoDB for the first time, basic pymongo usage, MongoDB aggregation including MapReduce and the new aggregation framework, and GridFS. I'll try to cover each major section of it using simple examples. Aggregation pipeline support preview will allow Azure Cosmos DB developers using MongoDB API to perform data manipulation in multistage pipelines even within a single query, enabling the streamlined development of more sophisticated applications. Any insight will be greatly appreciated. Translate MongoDB queries (find, aggregate or SQL query) to various target languages: MongoDB Shell, JavaScript (Node. You can try it out with minimal risk by using the MongoLab hosted experimental service. Specify the name of each field to add and set its value to an aggregation expression. It uses a simple declarative API, similar to the Django ORM. Starting in MongoDB 4. In the following example, the aggregation pipeline. Changed in version 2. So what is Aggregation :- In one liner we can say Aggregation performs operations on documents and provide the computed result. These pipelines process data by passing documents through a series of stages that filter, group, sort, transform, or perform operations on the data. It ignores non numeric values. mongodb group() vs mapreduce vs aggregation framework The group() command, Aggregation Framework and MapReduce are collectively aggregation features of MongoDB. function buildFilterPipeline(modelType, data) { var aggregate = modelType. MongoDB provides the db. js MongoDB MongoDB Get Started MongoDB Create Database MongoDB Create Collection MongoDB Insert MongoDB Find MongoDB Query MongoDB Sort MongoDB Delete MongoDB Drop Collection MongoDB Update MongoDB Limit MongoDB Join Raspberry Pi. The aggregation query consists in defining several stages that will be executed in a pipeline. 14, including the aggregation pipeline builder, was released for general availability on June 26, 2018. MongoDB Async Driver. MongoDB Compass 1. My applications typically produce queries using the MongoDB Aggregation syntax. Robo 3T (formerly Robomongo) is the free, lightweight, open-source MongoDB GUI with an embedded mongo shell, real auto-completion, and support for MongoDB 4. Since there might be multiple stages, we pass an array to the aggregate function. aggregate() command in MongoDB. The most efficient way to analyze your data is where it already lives. txt) or read online for free. What does "Scale" even mean in the context of databases? When talking about scaling, people have jumped to the vendor-induced conclusion that: 129s for a medium-sized table with 50M records is lightning speed for MongoDB? Alright, we thought. total count [mongodb-user] MongoDB and MapReduce Assistance [mongodb-user] MongoDB Aggregation PHP [mongodb-user] Aggregation Functions in C#. I have collection that contains documents with below schema. To keep users out of map/reduce land in more cases, MongoDB introduced the aggregation framework, cobbled together. Alternatively, get the data out of mongodb using the hadoop connector and use Hadoop map/reduce. Aggregation Framework in MongoDB is developed on the concept of data processing pipelines. If you are interested in working with a different driver, refer to the MongoDB Driver documentation. Introduction. In simple words, MongoDB Aggregation has replaced the MongoDB Map/Reduce feature from v2. Group By Query) using SSIS MongoDB Source Component. MongoDB Compass 1. 这篇文章主要介绍了MongoDB中强大的统计框架Aggregation使用实例解析,文中举了Python和Java使用Aggregation的数据统计例子进行讲解,需要的朋友可以参考下. @mongo-aggregation : mongodb aggregation api provide wide functionalities, and in order to get ordered duplicated text (field article ) with total repetitions and a list of Article ID this is the. Running the same query on 2. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. 6 removes the use of aggregate command without the cursor option unless the command includes the explain option. So, you just need to add an empty "cursor" document. The Getting Started guide contains installation instructions and a simple tutorial to get up and running quickly. Single Purpose Aggregation Operations. 14 from the Download Center. In this case, 36 documents match the query "property. Aggregations are a set of functions that allow you to manipulate the data being returned from a MongoDB query, and in this article, we'll explore MongoDB aggregations by demonstrating a few. mongodb-aggregate-adventure will run through a series of MongoDB aggregation workshops.