Category
Sort By
MongoDB provides a rich set of aggregation. $group is one of them, with the help of $group, we can group documents (similar as group By in SQL). Lets understand by an example: Suppose we have following collection of blogs: [js] { userId:1, name:"Suroor", title:"AngularJS: Getting started with Directive", rating:3} { userId:2,...
MongoDB provides several ways of computing the average value of a group in a collection. One of the simplest ways of determining average is using the method db.collection.group(). The method db.collection.group() bunches the documents of a collection on the basis of the keys mentioned and executes aggregation functions on them. This...
In my previous post, I explained how to get started with node.js and executing your first script with node. Now in this tutorial, we will go a step ahead and learn using Expressjs and MongoDB. For people who are new, Express is a web application framework for node which provides a set of features that can be used to build single-page as...
In this post, we will learn how to use javascript as MongoDB shell script to export (fields of) a collection. If you just want to execute MongoDB commands then look at the another post there.. OK, so let's focus back to the objective of this post. Generally, to export data from a MongoDB collection, we use the...
MongoDB uses javascript interface for the shell commands. We can really use this feature in a great way - by writing the MongoDB (shell) commands in a javascript (.js file) and execute in single go. In this blog, I am going to show an example for the same: [javascript] print('===== My Demo Script ====='); ...
