mongodb aggregation pipeline examples

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

/*** 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

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

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

Always think that the aggregation in MongoDB is the aggregation pipeline, today saw the introduction of the official website to have more understanding. The role of aggregation: Put multiple records together, and then get a single result through a

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

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

Initializing the MongoDB database> Use dengswitched to DB deng> db.createcollection ("Jingdong") #无參数 {"OK":1}> show Collectionsjingdongsystem.indexes> userdoc1= ({"user_id": 1, "name": "Cloud", "state": "Active", "actor": "User", "

This article mainly introduces the introduction of the use of MongoDB driver in PHP7, has a certain reference value, now share to everyone, there is a need for friends can refer to PHP7 can only use MongoDB driver to drive MongoDB.