迹忆客 EN >

To perform aggregation operations with MongoDB, you need to have a good understanding of the aggregation pipeline stages. This tutorial will explore $sort the stages through an example to perform a MongoDB aggregation sort. MongoDB Aggregat...

This article teaches you how to use pipelines in MongoDB's lookup Aggregation Pipeline operator. Before proceeding, you must have enough knowledge about the aggregation pipeline and the Aggregation Pipeline operator to understand the use of...

MongoDB is very hungry for unstructured data and belongs in any database developer's toolset. Some aggregation processes are much slower than relational databases, even with existing indexes. This is the case when using joins between collec...

Today, we will merge two collections into one using $lookup the Aggregate stage, the pipeline AND $unwind operator, the Filter stage, and MongoDB Compass. $project Merge two collections into one using MongoDB We have different ways to combi...

This article is a step-by-step installation and configuration guide for Elasticsearch on Windows and Ubuntu 20.04. It also demonstrates using Elasticsearch with MongoDB on both operating systems. What is Elasticsearch Elasticsearch is a NoS...

This article will explore the number of ways to get the last N records in MongoDB, where N is a positive number greater than zero. We will see how to retrieve the number of documents with and without sorting. Get the last N records in Mongo...

Today, we will discuss fuzzy search and how to do it with MongoDB. We will start by using $regex the operator and $text the query. In addition, we will learn to Fuse.js perform fuzzy search on documents using a JavaScript library called . W...

This article demonstrates how to convert a timestamp to a date in MongoDB. It also explains how to count entries for a specific date. Convert Timestamp to Date in MongoDB Converting from timestamp to date depends on the type we are saving t...

This article is about performing bulk updates of documents in MongoDB using the Java driver. We will also learn how to update by adding new fields, changing the value of an existing field or array, or deleting documents. Prerequisites For t...

Today, we will learn how to project nested fields when querying data in MongoDB using the $project and $unset aggregation stages, forEach() loops, and methods. mapReduce() MongoDB item nested fields In MongoDB, we can find() retrieve all do...

This article will discuss how to efficiently update multiple documents in MongoDB. updateMany() Methods in MongoDB Using the update method in MongoDB db.collection.updateMany() , you can update multiple documents in a collection. This metho...

$in Operator searches within an array that you provide. For example, if you are given an array and want to search for one or more matching elements in a MongoDB collection, you can use $in . Use $in the operator to search for a specified ar...

In any database, we need to organize the data in a way that we can easily find that data when necessary. To do this, it is very important to create a unique identity. In MongoDB, there is a built-in unique identification system using a fiel...

MongoDB stores all data records in separate BSON documents. An identifier is provided to uniquely identify each document. The identifier helps users uniquely locate the document when searching for other documents. With the help of identifie...

This MongoDB tutorial discusses the issue of returning Date-based queries. In addition, there is also a good tutorial on how to use Date Range queries in MongoDB. Using date ranges in MongoDB We will learn to write MongoDB date range querie...