zainabed.com is collection of programming tutorials, created & maintained by Zainul Abedin Shaikh. These tutorials are predominantly focused on Programming Technology like Java, Java Web,Spring MVC, AngularJs,Elasticsearch, Android, JQuery, Web Design, Mongodb, PHP and MySQL.
MongoDB Aggregation Framework groups set of documents together and performs certain operation on this grouped documents and returns results in the form of documents.
MongoDB aggregation answer to those query which requires grouping of documents.
Aggregation framework works on three type of model
Single Purpose Aggregation Operations
Now let see how MongoDB Aggregation Framework works with simple example.
Suppose you are MongoDB application developer in a respected company and you have been given a MongoDB database that holds information about human population which is distributed according to cities and their states.
This post demonstrate how to generate SSH private and public key with fundamental steps and assist you to add public key inside your GitHub and Bitbucket account. But first why we need this SSH public key ? Whether you are working in the team or an individual and you want make any operations on secure GIT repository like clone or push your latest changes then you require to provide your credentials to help GIT to authenticate you and approve those operations. But when you do so, you are asked to provide your username & password , each time on each operation . It looks simple earlier, but later becomes a headache . SSH connection helps us to authenticate using public and private keys, that we generate only once, later we don’t need to authenticate , SSH will do this behalf of us . But how does it work ? SSH authenticate you using an identity , your identity and this identity comprise combination of p