Explain or condition in mongodb with suitable example. This operator uses the following basic syntax: db.

Explain or condition in mongodb with suitable example. executionTimeMillis value.

Explain or condition in mongodb with suitable example For example, Let us assume, higher-level entity set student which has attribute student type. MongoDB is the document database designed to make it easy for developers to work with data in any form, and from any programming language. MongoDB’s aggregation pipeline allows developers to perform complex transformations and analytics directly within the database, eliminating the need for additional tools. This makes it easy to operate with dynamic and unstructured data and MongoDB is an open The db. The db. Here we also discuss the definition and how does MapReduce command work in MongoDB? Along with different examples and code implementation. MongoDB Compass. queryHash, the explain. MongoDB provides a document data model that lets you store and combine any type of data while also offering sophisticated data access and rich indexing features. explain() to. Whether you’re just firing up your first MongoDB Atlas cluster, or you’re a long-time veteran user, we put together our best set of useful examples to refresh your knowledge or help you get your bearings. We will use MongoDB Atlas and MongoDB Compass to demonstrate how. In MongoDB’s case, this language is the MongoDB Query Language or simply, MQL. Cheat sheet for CRUD operations and querying for database. MongoDB also lets you enforce a schema to validate your data and maintain a data structure. Can handle multiple statements within each branch Jan 8, 2025 · The bulkWrite() method in MongoDB is a powerful tool that allows for the execution of multiple write operations with a single command. Return Values: Can be used to directly return a value. In this tutorial – MongoDB Map Reduce, we shall learn to use mapReduce() function for performing aggregation operations on a MongoDB Collection, with the help of examples. Query 1: Find all documents in a collection operation with suitable example using MongoDB. I there is the same field wouldn't be in several conditions, maybe it could be something like: When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys; i. explain() method wraps the explain command and is the preferred way to run explain. From basic CRUD operations to advanced aggregation and indexing, the MongoDB API makes it Embedded Documents in MongoDB with Examples. explain. Unlike the explain. In this tutorial, we will learn how to handle the explain() method provided by the Mongo database. We’ll explain what they do, then share examples so you can see how they work. In this blog post, we will look at some common MongoDB queries examples with answers for dev platform. By removing unnecessary indexes, we can free up system resources and ensure faster query execution. In this article, we will explore the fundamentals of querying data in MongoDB using Python, covering its various functionalities and methods. One of the core functionalities of MongoDB is its ability to… Jun 9, 2024 · MongoDB, one of the most popular NoSQL databases, offers powerful tools for data aggregation. If the condition returns true the value of x is returned, else the value of z is returned. The operation in the example: Groups by the item. explain() operations can return information regarding: explainVersion, the output format version (for example, "1");. students. deleteMany() method. The order of conditions matters; incorrect ordering can lead to unexpected behavior. Jul 11, 2023 · MongoDB is a popular NoSQL database that stores data in JSON-like documents. updateMany() New in version 3. Python provides two primary types of such loops: while loop: Continues to execute as long as a given condition is true. In MongoDB: index usage and MongoDB explain() we introduced the main index types supported by MongoDB, and how to create and use them. cursor. Working wtih $and. Examples of Race Condition: Example 1: Tube Light ON and OFF. The explain command provides information on the execution of the following commands: aggregate, count, distinct, find, findAndModify, delete, mapReduce, and update. Code Blocks: Handles a single expression in each branch. As with any database, MongoDB has a language that a user can use to access data. Consider a database for the marks and attendance. collection. The examples in this section include aggregation pipeline alternatives without custom aggregation expressions. If you have a large set of BSON files, you can import BSON files to MongoDB to see the contents of the file from there. This is a guide to MongoDB MapReduce. After evaluating the explain, I have to say it Jun 19, 2023 · MongoDB Commands and Operations to get started quickly. In MongoDB, when you execute find() method, then it displays all fields of a document. Functions help in organizing code, promoting reusability, and improving readability by encapsulating a set of instructions under a single name. . For list of query modifiers, see db. Query objects in Mongo by default AND expressions together. Explanation. The following examples use the db. A hash of the key for the plan cache entry associated with the query. May 9, 2024 · The $or operator takes more than one condition/expression as its value. In MongoDB, you are allowed to create an embedded document/ Nested document. *, roles. In this article, we’ll explore the dropIndexes() in MongoDB and explain how to use the MongoDB in During steady state operations (when the query plan is cached), or when using cursor. explain() method in MongoDB is a tool used to explain the query plan, which can help developers view how MongoDB executes queries and optimize query performance. . COLLECTION_NAME. MongoDB database tools are a suite of command-line utilities for working with MongoDB. Chapter 3: MongoDB - Conditional Query. Explore your MongoDB data with mongosh, Compass, VSCode or a MongoDB driver. To use a transaction, start a MongoDB session through a driver. MongoDB identifies documents based on the condition defined in a query and then returns those documents to its intended destination. MongoDB mapReduce() method can be used to aggregate documents in a MongoDB Collection. Unlike SQL databases, MongoDB uses collections and documents instead of tables and rows. Better suited for complex conditions and multiple statements. B. Returns one document that satisfies the specified query criteria on the collection or view. deleteOne() method. aggregate() will give you the desired results (documentation here). Query Documents. find(). myCollection. find({ condition }) Example: Sep 18, 2024 · Allows handling multiple conditions in a structured manner. hint() with cursor. As we know that in the mongo shell, documents are represented using curly braces ( {} ) and inside these curly braces we have field-value Jan 28, 2015 · @RishabhPandey - The redact operator takes a document at a particular level, checks if the document at that level has met a particular condition, based on the output of the condition, it can either descend into the document's sub documents or prune the document or keep the document as it is and not descend. Data transformations. Below are examples of check constraints. Find documents that match multiple conditions. Simple Query Example ## Connect to MongoDB mongo ## Select a database use myDatabase ## Find all documents in a collection db. The cursor. executionTimeMillis value. Nov 7, 2012 · Explain a LINQ query as a strongly typed object (does it use an index for example) Convert a LINQ query to the JavaScript code run in MongoDB Check it out and contribute if you find it interesting. This page summarizes the conditional operators in MongoDB. MongoDB provides a list of projection and Query operators to retrieve BSON type value. command, which details the command being explained; Jul 2, 2024 · The MongoDB dropIndexes command is an important tool for managing and optimizing database performance. Use "in" or "where". Examples Feb 10, 2024 · In this example, we have a collection called books, and the rating key in the document is indexed, As you see in the picture above, MongoDB created a “Book_Rating” list which stored the value During steady state operations (when the query plan is cached), or when using cursor. Aggregation with the Zip Code Data Set Use the aggregation pipeline to group values and to calculate aggregated sums and averages for a collection of United States zip codes. This operator uses the following basic syntax: db. Since MongoDB stores the data in BSON (Binary JSON), you can easily store and retrieve all your data in JSON format. Creating Embedded Documents – In MongoDB, you can easily embed a document inside another document. Reduces the need for nested if-else statements. MongoDB transactions work similarly to transactions in other databases. find() construct allows for the additional chaining of query modifiers. find() method reads operations in mongoDB shell and retrieves documents containing all their explain operations can return information regarding:. mapReduce() method. This comprehensive guide will walk you through interpreting MongoDB query plans, providing insights into how queries are executed, and offering strategies to enhance database efficiency and response times. Aggregation is the process of selecting data from a collection in MongoDB. For older versions >= 2. There are plenty of online BSON text viewers that are capable of opening BSON files. This is because a $text query must use an index, and $or can only use indexes if all its clauses are supported by indexes. The $and operator allows you to specify multiple conditions that documents must satisfy to match the query. The query of the MongoDB find() method where multiple conditions are set is provided be Dec 11, 2018 · In an SQL database, I would simply include the condition in the join: select users. Jul 6, 2021 · Example. For example: A company might keep separate files for employees' details, customer information, and daily sales. 1 explain() method in the Mongo database. Ask Question Asked 11 years, 10 months ago. A document retrieval query can have a projection that mentions conditions or criteria that match with the fields of the document that needs to be returned. ObjectId is a 12-byte hexadecimal number that uniquely identifies documents in a collection. finish(), to return the explain() results. find() ## Find documents with specific criteria db. In order to explain the $or operator with an example, lets create a collection with few documents. Let us further explore the definition of CRUD and examine how to execute MongoDB CRUD operations using the MongoDB Query Language (MQL). Oct 3, 2012 · Starting with MongoDB version 3. In addition to the basic queries, MongoDB provides several data aggregation features. db. Jan 8, 2025 · These are the following different types of indexes in MongoDB: 6. is_admin = 1; -- ^^^^^^^^^^^^^^^^^^^^^ Mar 7, 2023 · MongoDB is a popular document-oriented NoSQL database that allows users to store and manipulate data in a flexible, schema-less manner. Nov 15, 2021 · Query an Array with Compound Filter Conditions on - MongoDB Loading Jan 8, 2025 · The MongoDB dropIndexes command is an important tool for managing and optimizing database performance. In this article, we’ll explore the dropIndexes() in MongoDB and explain how to use the MongoDB in Nov 26, 2024 · Description. When the expression (y > z ? y : z) gets executed it further checks the condition y > z. If it chooses to descend into the sub When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys; i. One of the most powerful features of MongoDB is its aggregation framework, which allows Jan 8, 2025 · In this article, We will learn about MongoDB Map-Reduce by understanding various examples, When to use and How to use Map Reduce in MongoDB in detail. This approa Jan 28, 2025 · The MongoDB dropIndexes command is an important tool for managing and optimizing database performance. In this article, We will learn about various Aggregation Pipeline Stages in MongoDB with the help of examples and so on. Therefore, we get the largest of three numbers using the ternary operator. This chapter introduces the conditional query of MongoDB, which is similar to the comparison operators such as equal, greater than, and less than in SQL statements. Its gonna be something like this: Pretty cool, first time I see a function used with Mongo!! Feb 2, 2024 · This tutorial provides a comprehensive understanding of using $and and $or operators, with examples spanning from basic usage to more advanced scenarios. command, which details the command being explained; Jan 8, 2025 · The MongoDB findOneAndUpdate() method is used to update the first matched document in a collection based on the selection criteria. There is even a free tier so you can get a feel for the product and how you Oct 3, 2024 · Conclusion. A few examples of delete operations are deleting products from a user’s cart, deleting a book from favorites, and deleting all the records older than a certain time period (bulk delete). totalKeysExamined Feb 16, 2024 · In PHP, a function is a block of code that performs a specific task and can be executed multiple times throughout a script. Recommended Articles. explain() with the following key differences: The db. Oct 25, 2024 · What is ObjectId in MongoDB. To take advantage of the cloud and the managed database as a service model, use MongoDB Atlas. explain with the same range. Use aggregation to group values from multiple documents, or perform operations on the grouped data to return a single result. MongoDB provides a powerful and flexible query language that allows you to perform various operations on your data. Example. For alternatives that use custom expressions, see Map-Reduce to Aggregation Pipeline Translation Examples. role_id = roles. These files could be stored as text documents, spreadsheets, or printed records in cabinets. Nonetheless, there are cases where true multi-document, multi-collection MongoDB transactions are the best choice. MongoDB Map-Reduce MongoDB Map-Reduce is a data processing programming model that helps to perform operations on large data sets and produce aggregated results. In this page we are going to discuss about the conditional operators and usage of conditional operators. We can also specify multiple conditions in the find() method by including multiple key-value pairs in the query parameter. id = inter. This guide is designed for complete beginners, so don’t worry if you’re just starting! Let’s dive into the world of MongoDB and learn how […] Sep 28, 2015 · being a newbie to mongo, stuck in a conditional query: I want to perform a search on the basis of 3 criteria, first name, last name and email id: below query works perfect when all the fields exist Sep 6, 2018 · This is the second part of a two parts series. 0, simply changing the order from. This method is particularly useful for efficiently performing batches of operations, reducing the number of round trips to the database server and thus improving performance. Syntax: collectionName. Here’s the basic syntax: Feb 7, 2022 · You can use the $or operator in MongoDB to query for documents that meet one of multiple criteria. createIndex({KEY:1}) As values are added to the collection, the indexes will be updated. user_id left join roles on inter. MongoDB Embedded Documents. updateOne() New in version 3. In this article, We will learn about MongoDB findOneAndUpdate() in detail by understanding various examples and so on. Indexes support queries, update operations, and some phases of the aggregation pipeline. By Prof. This type of constraint is defined on two or more attributes for the given entity which is further divided into subclass Jun 5, 2017 · The 'query optimizer' link in the 'explain' command link posits that 'For each query, the query planner searches the query plan cache for an entry that fits the query shape', then at the end adds that 'Changed in version 2. With MongoDB, you don’t have to reinvent the wheel every time your business requirements change or evolve over time. Introduction. It offers various options such as sorting, upserting and returning the updated document. In this case one field can be in several conditions. Example 2: In this example, we are deleting all the documents from the student collection using db. find({ "$or": [ {"field1": "hello "}, {"field2": {$gte: 10}} ] }) Feb 2, 2024 · This MongoDB tutorial teaches you how to use the $or operator with a MongoDB query to perform logical OR operations on the array, which consists of two or more expressions, and also select or retrieve only the documents that match at least one of the expressions given in the array. Conclusion Mar 7, 2024 · In this article, I will explain the main principles of building aggregate queries in MongoDB and how to take advantage of indexes for speeding them up. The syntax is as follows: Study and design a database with suitable example using following database systems: • Relational: SQL / PostgreSQL / MySQL • Key-value: Riak / Redis • Columnar: Hbase • Document: MongoDB / CouchDB • Graph: Neo4J Compare the different database systems based on points like efficiency, scalability, characteristics and performance. aggregate(). Do you need to optimize MongoDB queries? Jan 7, 2025 · Check constraints validate data based on specific conditions, ensuring that only logical values enter the database. MongoDB’s document database is general purpose and suitable for most scenarios. MongoDB's find() method, explained in MongoDB Query Document accepts second optional parameter that is list of fields that you want to retrieve. totalKeysExamined MongoDB provides the following methods to update documents of a collection: db. In addition to the false boolean value, $or evaluates as false the following: null, 0, and undefined values. id or users. users. Aggregation basics in MongoDB with examples – Part 1 Aggregation is one of the most important concepts of MongoDB. Evaluates one or more expressions and returns true if any of the expressions are true. When we start using MongoDB in the early stage of application. MongoDB can use all but the geoHaystack index to support $or clauses. e. MongoDB provides various query operators to create complex queries: Comparison Operators Jun 18, 2023 · Create Index. Check constraints, add precision and enforce logical consistency in Jul 14, 2017 · MongoDB provides a really great feather, which is “explain”, on helping DBAs to understand what’s going on inside the query command execution. In MongoDB, we don't need 4 min read . 1 Single field. Just like what is happening in our "command line pipe" example, where we take "input" then "pipe" to a grep to "remove" or "filter". help(). It allows Feb 3, 2024 · Introduction MongoDB is a NoSQL database that provides a high level of flexibility and scalability for managing large amounts of unstructured data. 2. Apr 18, 2024 · Let’s look at some examples of delete operation from CRUD in MongoDB. Because MongoDB can read indexes in both ascending and descending order, the direction of a single-key index does not matter. planCacheKey is a function of both the query shape and the currently available indexes for that shape. All the entities of student are evaluated by definition of attribute of student. MongoDB does not need to examine documents from the collection to return the results. Although MongoDB provides the explain command, the preferred method for running explain is to use the db. MongoDB Atlas is a fully managed cloud database service. In this second article, we are going to see some examples on how to use explain() method to investigate queries. Jan 21, 2021 · aggregation and indexing with suitable example using MongoDB. Its ability to handle vast datasets makes MongoDB suitable for social media monitoring, fraud detection, and dynamic pricing systems. You can use the Query API to perform: Adhoc queries. 23 COMMON MONGODB OPERATORS & HOW TO USE THEM In this article, we will take a look at the most commonly used query operators. For details on the output, see Explain Results. It provides automated backups, monitoring, and security features. Mar 19, 2024 · Complex Conditions: Suitable for simple conditions. 6? MongoDB provides a document data model that lets you store and combine any type of data while also offering sophisticated data access and rich indexing features. Nov 19, 2024 · Every query in MongoDB is directed at particular documents. Unlike standard relational databases, MongoDB stores data in a JSON document structure form. This method returns a cursor to the retrieved documents. find() construct allows for the additional chaining Jan 23, 2025 · MongoDB is a flexible and scalable NoSQL database that excels in managing unstructured data, offering advantages like dynamic schema design and high performance, while also facing limitations such as restricted ACID transactions and increased memory usage. replaceOne() New in version 3. Jul 6, 2017 · And this is generally good practice since it removes any documents that did not meet required conditions from further conditions. MongoDB provides a powerful and flexible set of methods for managing data in its collections. # while loop In the following example, you will see a map-reduce operation on the orders collection for all documents that have an ord_date value greater than or equal to 2020-03-01. The Race Condition usually occurs at the case of Tube Light which has multiple switches. Attribute defined. MongoDB, a renowned NoSQL database allowing high-performance, agile development practices through its non-relational datastore. Learn MongoDB Aggregation with a real-world example. Oct 21, 2022 · MongoDB is a document-based NoSQL database where data is organized in collections that are made up of JSON documents. explain() returns a cursor, which requires a call to . Given below is an example of the conditional definition database −. { $or: [ <expression1>, <expression2>, ] } For more information on expressions, see Expression Operators. Disadvantages of If-Elif-Else Conditional Statement: Can become lengthy and harder to maintain with many conditions. It looks like this query works in mongodb console. In this article, I am going to discuss Embedded Documents in MongoDB with Examples. explain() helpers. find({"age": 25}) Query Operators. Please read our previous article where we discussed Deleting Documents in MongoDB with Examples. However, before starting a project, you should always consider when to use a NoSQL database. Then, use that session to execute your group of database operations. Jan 8, 2025 · What is MongoDB? As we already explain that, MongoDB is a document-oriented NoSQL database system that provides high scalability, flexibility, and performance. Aggregation Examples¶. MongoDB Aggregation Example. May 9, 2024 · 4. sku field, and calculates the number of orders and the total quantity ordered for each sku . * from users left join users_x_roles inter on users. We only need to write simple CRUD-based queries that fetch the data from MongoDB. Sep 29, 2024 · Welcome to this comprehensive guide on MongoDB querying with Python. Mongo currently does not include an OR operator for such queries, however there are ways to express such queries. When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys; i. (This article is part of our MongoDB Guide. Example 1: In this example, we are deleting a document from the student collection using db. ) What are MongoDB operators? Aug 5, 2024 · Condition-Defined: In this lower-level entity sets, evaluation of membership is on basis whether an entity satisfies an explicit condition or not. MongoDB conditional operators are a set of special operators used to perform conditional checks, including ifNull, cond, and switch, which can be used to perform conditional branching and data conversion operations in aggregation queries. Otherwise, $or returns false. In the Mongo universe, the explain() method returns a document along with the information on the query plan. While those, and similar, platforms are fast, the data transfer from MongoDB to them can be slow and potentially expensive. Aggregation operations can be performed in two ways: Jan 8, 2025 · The MongoDB dropIndexes command is an important tool for managing and optimizing database performance. If multiple documents satisfy the query, this method returns the first document according to the natural order which reflects the order of documents on the disk. First, you need to install the MongoDB database tools. 6: explain() operations no longer read from or write to the query planner cache', which confuses me: how does it work in versions later than 2. In this article, we’ll explore the dropIndexes() in MongoDB and explain how to use the MongoDB in Aggregation in MongoDB. MongoDB explain() Example. It is complicated as well. Aggregation is a process that allows you to transform and analyze data in your MongoDB collections. In this article, we’ll explore the dropIndexes() in MongoDB and explain how to use the MongoDB in When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys; i. explain() method can be called after aggregation pipelines, find, findOne, and other query operations in MongoDB. find() is similar to db. This article will explain what aggregation is in MongoDB and how to build MongoDB aggregation pipelines. explain() and cursor. Aggre Feb 3, 2024 · Introduction. I mean example MongoDB collection document objects that you're trying to execute this query over. The $or operator can be used in a query to match documents where at least one of the given expressions is true. createIndex({“item”:1}) In this example, we are creating a single index on the item field and 1 here represents the filed is in ascending order. A conditional operator compares two expressions and fetched documents from mongodb collection. May 18, 2012 · Instead of language there could be any field that can have multiple values. Khivsara Note: The material to prepare this presentation has been taken from internet and are generated only for students reference and not for commercial use. Understanding query plans is crucial for developers working with MongoDB to ensure optimal database performance. Jan 11, 2025 · In earlier times, data was stored and retrieved using files in a typical file system. Jan 20, 2025 · find({condition}) method can be used to retrieve only the required documents based on some conditions from the collection. Create a sample collection orders with these documents: When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys; i. - Download as a PDF or view online for free Apr 13, 2012 · For example, running a count on a non-indexed field for a range takes exactly the same amount of time as running a find. The Query API comprises two ways to query data in MongoDB: CRUD Operations. Jun 5, 2024 · MongoDB aggregation pipeline is a powerful framework for data processing that allows documents to perform sequential transformations like filtering, grouping, and reshaping. The overall document size must not exceed 16 MB. In MongoDB, update operations target a single collection. Validate that Age in a student table falls between 5 and 25. Use the right-hand menu to navigate. find() method is used to retrieve documents from a collection. This method has the following prototype form: Sep 14, 2021 · In MongoDB, you can only nest document up to 100 levels. Syntax of Mongo mapReduce() Apr 7, 2013 · Conditions in MongoDb. Aggregation pipelines. Jan 5, 2010 · MongoDB query with an 'or', 'and', condition combined. I will try to explain to you a few basics using examples. explain:true Feb 28, 2023 · Reduce function and map function are the two primary inputs of the MapReduce command in MongoDB. MapReduce command is handy and important in MongoDB. queryPlanner. Consider a Tube Light, two switches. All write operations in MongoDB are atomic on the level of a single Name the functional group of organic compounds that can be hydrogenated With the help of suitable example explain the process of hydrogenation mentioning the conditions of the reaction and any one change in physical property with the formation of the product Name any one natural source of organic compounds that are hydrogenated - The functional groups of organic compounds that can be Feb 18, 2019 · The best way to answer questions like this is to look at explain output to take a look at how Mongo actually handles a query like this. This Tube Light with multiple switches is the biggest example for the Race Condition which has occurred in Operating Systems. For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page. A. Syntax. Feb 1, 2022 · By using the built-in aggregation operators available in MongoDB, we are able to do analytics on a cluster of servers we're already using without having to move the data to another platform, like Apache Spark or Hadoop. explain(). For example, MongoDB can return counts of the number of documents that match a query, or return the number of distinct values for a field, or process a collection of documents using a versatile stage-based data processing pipeline or map-reduce operations. Easy guide for connecting nodejs application to MongoDB. MongoDB Query documents In MongoDB, the db. If you take a look at the winningPlan in the query-plans below, you can see that they're exactly the same! MongoDB Map Reduce. Enforce Salary > 0 for all employees in a payroll table. Mar 7, 2018 · 2. Furthermore, I will introduce the most important stages of the aggregation pipeline with short examples using each one, and how to apply them to the pipeline. 2) Incremental Map/Reduce An incremental Map/Reduce approach can be used to calculate aggregate stats in successive batches (for example, from an hourly or daily cron job). The syntax of creating an index is: >db. next(), or its alias . If the condition returns true the value of y is returned, else the value of z is returned. 6, you will need to use the explain option for aggregation pipeline operations. MongoDB Compass is a graphical user interface for MongoDB. The MongoDB Query API is the mechanism that you use to interact with your data. MongoDB can traverse the indexes either in the ascending or descending order for single-field index. explain(), MongoDB bypasses the plan selection process, resulting in a faster actual time, leading to a lower explain. This refers to specifying conditions on more than one attribute. It checks the condition before executing the loop body. If $or includes a $text query, all clauses in the $or array must be supported by an index. I wrote a function called timeCount that takes the average of the count function time, and then shows the explain output for comparison. It processes multiple documents and returns computed results. executionStats. Primarily used for control flow; does not return values directly. Jan 9, 2025 · While Python supports loops that can incorporate conditions, the term "conditional loops" might specifically refer to loops that run based on a condition. 2. Jan 8, 2025 · The MongoDB dropIndexes command is an important tool for managing and optimizing database performance. ‍ Explain output is limited by the maximum Nested Depth for BSON Documents, which is 100 levels of nesting. collection. Explain output that exceeds the limit is truncated. In this article, we’ll explore the dropIndexes() in MongoDB and explain how to use the MongoDB in Nov 3, 2012 · The MongoDB manual describes this use case in more detail: Pre-Aggregated Reports. MongoDB Atlas. explainVersion, the output format version (for example, "1");. This document provides the practical examples that display the capabilities of aggregation. mcu kgmtqt rfqfx gib swebh zktpw amm qohanm twb cork ilbku wpxy yjuu oubiukc pumpjzs