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The NoSQL we use in this article is MongoDB, which is an open-source document database system with the development language C ++. It provides an efficient document-oriented storage structure.
The NoSQL we use in this article is MongoDB, which is an
/*** 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*
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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
Original link http://www.cnblogs.com/zhangzili/p/4975080.htmlMongoDB knowledge points at a glance1. Start the MongoDB database:Go to the MongoDB installation directory and execute the following commandC:\Program
MongoDB is a document-oriented database, which is currently developed and maintained by 10gen. It has rich functions and is complete and can completely replace MySQL. In the process of using MongoDB as a product prototype, we summarized some
Aggregate is the more important of the many tools that MongoDB provides, similar to the one in SQL statements GROUP BY . The aggregation tool allows developers to manipulate data in the database directly using MongoDB native commands, and aggregates
MongoDB Aggregation (aggregate) is used primarily to process data (such as statistical averages, sums, and so on) and to return computed data results. Somewhat similar to the count (*) in an SQL statement.
Aggregate () method
Methods of
Http://www.cnblogs.com/yoolonet/archive/2011/08/27/2155701.html
A series of articles about MongoDB recently used MongoDB as a data storage system to record their own applications and problems in actual development. I hope this will be helpful to my
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