mongodb aggregation framework examples

Mongodb advanced 2: mongodb aggregation and mongodb advanced AggregationIn the previous article we talked about mongodb's advanced query: http://blog.csdn.net/stronglyh/article/details/46817789 This article introduces mongodb aggregation. I. mongodb

/*** MongoDB $type operator*/ /*** The $type operator is based on the Bson type to retrieve the matching data type in the collection and returns the result.* The types of MongoDB that can be used are shown in the following table:* Type Number Notes*

The recent new project to use MySQL, while not yet forgotten, summarizes the following MongoDB aggregations.aggregation refers to the various operations that can handle batch records and return results. MongoDB provides rich aggregation operations

in the two previous articles the basic aggregation function of data aggregation in MongoDB count, distinct, group > and the MapReduce of data aggregation in MongoDB >, we've provided two implementations for data aggregation, and today, in this

First, IntroductionMongoDB's aggregation framework, which is used primarily to transform and combine the documents in a collection to make use of the data for analysis.The basic idea of the aggregation framework is:Multiple artifacts are used to

In the previous article we talked about MongoDB advanced query: http://blog.csdn.net/stronglyh/article/details/46817789This article is about MongoDB aggregation.A: MongoDB has a lot of aggregation framework, so that the transformation and

March 25 MongoDB (taken from "Humongous") 1.4 release shortly after its founder Dwight Merriman (formerly DoubleClick Ceo/cto) announced 10gen--open source document database MongoDB behind the company, It will provide business training and

Recently has been using MongoDB, sometimes will need to use statistics, on the Internet to check some information, the most suitable for use is to use aggregate, the following introduction of their own use of experience. MongoDB

Java Advanced Software Architect Practical Stage 1 video tutorialThunder Download Baidu CloudSection No. 001: Overview of the overall courseSection No. 002: Sub-modules, sub-project managementSection NO. 003: Multi-Module Multi-Web application Merge

Goodbye to MongoDB, hello PostgreSQL Olery was founded almost five years ago. It started with the single product (Olery Reputation) developed by Ruby proxy. Over time, we began to work on a series of different products and applications. Today, our