mongodb select distinct multiple fields

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

Brief introduction MongoDB is a NoSQL database based on distributed file storage Written by the C + + language, stable and high performance Designed to deliver scalable, high-performance data storage solutions for WEB applications

Some basics forget to check at any time.#整备恢复Mongodump--port 20001--authenticationdatabase=admin-u *-D lvlv-c lvlv-o/homeMongorestore--drop--host 172.16.201.74--port 20001--authenticationdatabase=admin-umgbackup-d test/tmp/liding/test

MongoDB is written by C ++ and its name comes from HuMongoIn the middle of the word "us", we can see from the name that its ambition lies in the processing of massive data. The simplest description of this database is scalable, high-performance,

Sample Code for common mongodb select operations in php, mongodbselect We have mentioned mongodb installation, configuration, cluster, and php insertion and update. For more information, see mongodb.The following describes common mongodb select

about MongoDB MongoDB is a NoSQL database based on Distributed file storage Written by the C + + language, stable and high performance Designed to deliver scalable, high-performance data storage solutions for WEB applications

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

Preface The previous operation facing MongoDB has been done through the MONGO client process. But in reality, our operations on MONGODB data are often implemented through appropriate programs, such as PHP, Java, or Python. So how to operate MongoDB

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

1. Aggregation Frameworkusing the aggregation framework to transform and combine documents in a collection, you can create a pipeline (pipeline) with multiple artifacts to process a series of documents. These artifacts include filtering (filtering),