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You're reading from  MongoDB 4 Quick Start Guide

Product typeBook
Published inSep 2018
Reading LevelIntermediate
PublisherPackt
ISBN-139781789343533
Edition1st Edition
Languages
JavaScript
Tools
MongoDB
Concepts
Databases
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Doug Bierer
Doug Bierer
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Doug Bierer

Doug Bierer has been hooked on computers since his first program, written on a DEC PDP-8, in 1971. In his wide-ranging career, he has been a professional contract programmer since 1978, having written applications in BASIC, PL/I, assembler, FORTH, C, C++, dBase/FoxBase/Clipper, Pascal, Perl, Java, and PHP. He deployed his first website in 1993 while living in San Francisco. He speaks four languages, has traveled extensively, and now resides in Thailand. He also spent some years doing system administration and TCP/IP networking. Some of his technical works include PHP 7 Programming Cookbook and Learning MongoDB 4.x (Packt), as well as Learning PHP and MySQL, Learning PHP Security and Learning Doctrine (O'Reilly Media).
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An overview of aggregation

Before diving into the specifics, it's important to lay some groundwork. The first question which comes to mind is, What is aggregation? That question would be logically followed by, Why use it?

What is aggregation?

The main purpose of aggregation operations is to refine query results by grouping together field values from multiple documents, and then performing one or more transformations. Aggregation in MongoDB can be as simple as presenting the results of a query into a set of one or more fields, or as complex as performing a multistage query, breaking the output into buckets, and performing operations on each result set. A more advanced usage would be to manipulate complex fields within...

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MongoDB 4 Quick Start Guide
Published in: Sep 2018Publisher: PacktISBN-13: 9781789343533
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Doug Bierer

Doug Bierer has been hooked on computers since his first program, written on a DEC PDP-8, in 1971. In his wide-ranging career, he has been a professional contract programmer since 1978, having written applications in BASIC, PL/I, assembler, FORTH, C, C++, dBase/FoxBase/Clipper, Pascal, Perl, Java, and PHP. He deployed his first website in 1993 while living in San Francisco. He speaks four languages, has traveled extensively, and now resides in Thailand. He also spent some years doing system administration and TCP/IP networking. Some of his technical works include PHP 7 Programming Cookbook and Learning MongoDB 4.x (Packt), as well as Learning PHP and MySQL, Learning PHP Security and Learning Doctrine (O'Reilly Media).
Read more about Doug Bierer

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