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MongoDB Fundamentals

You're reading from   MongoDB Fundamentals A hands-on guide to using MongoDB and Atlas in the real world

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Product type Paperback
Published in Dec 2020
Publisher Packt
ISBN-13 9781839210648
Length 748 pages
Edition 1st Edition
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Authors (4):
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Juned Ahsan Juned Ahsan
Author Profile Icon Juned Ahsan
Juned Ahsan
Liviu Nedov Liviu Nedov
Author Profile Icon Liviu Nedov
Liviu Nedov
Amit Phaltankar Amit Phaltankar
Author Profile Icon Amit Phaltankar
Amit Phaltankar
Michael Harrison Michael Harrison
Author Profile Icon Michael Harrison
Michael Harrison
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Toc

Table of Contents (15) Chapters Close

Preface
1. Introduction to MongoDB 2. Documents and Data Types FREE CHAPTER 3. Servers and Clients 4. Querying Documents 5. Inserting, Updating, and Deleting Documents 6. Updating with Aggregation Pipelines and Arrays 7. Data Aggregation 8. Coding JavaScript in MongoDB 9. Performance 10. Replication 11. Backup and Restore in MongoDB 12. Data Visualization 13. MongoDB Case Study Appendix

Basic MongoDB Queries

All the queries in this section are top-level queries; that is, they are based on the top-level (also known as root-level) fields in the documents. We will learn about the basic query operators by writing queries against the root fields.

Finding Documents

The most basic query in MongoDB is performed with the find() function on the collection. When this function is executed without any argument, it returns all the documents in a collection. For example, consider the following query:

db.comments.find()

This query calls the find() function on the collection named comments. When executed on a mongo shell, it will return all the documents from the collection. To return only specific documents, a condition can be provided to the find() function. When this is done, the find() function evaluates it against each and every document in the collection and returns the documents that match the condition.

For example, consider that instead of retrieving all the...

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