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General Principles of Designing and Using MongoDB Database
In this guide, I will tell you about the document-oriented data modeling and organization of data in MongoDB at the levels of database, collection, and document. In addition, we will learn how to use some of the operations in MongoDB.
We need to write two queries with grouping and two queries using aggregate functions to their subject area in MongoDB.
Here is how we count the number of records in the collection called “Info1”:
And here is how we count values of the field “id” in all records of “Info1” collection:
We need to run the following commands to sort an “Info1” collection:
Output the records where the field “requests.topic” is equal to “HI”.
The following is the execution of the counterpart of the JOIN command using Map-reduce:
Here is the result of execution of the JOIN command:
Thanks for your attention!