How can be join two docuemnts in cosmos db or how to get data from multiple collections

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Hi,

Actually, I'm new is Azure Cosmos Db,I have a situation where I want get data from multiple collection.

Can anyone tell Is there any way to Join two documets or multiple collections.

thanks...

What I have tried:

I have tried self join itslef,but not able to join multiple colletions.

Posted 23-Jun-19 21:28pm

vish_pro

Updated 28-Nov-19 21:44pm

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Maciej Los 24-Jun-19 7:43am

What have you tried till now?

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Maciej Los · Answer 1 · 2019-06-24T05:40:00

Don't be lazy. Google is your friend! :)

Start here: Getting started with SQL queries in Azure Cosmos DB | Microsoft Docs[^]

And take a look at Azure Cosmos DB: .NET examples for the SQL API | Microsoft Docs[^] too:

Quote:
Collection examples

The RunCollectionDemo[^] method of the sample CollectionManagement project shows how to do the following tasks. To learn about Azure Cosmos collections before you run the following samples, see Work with databases, containers, and items[^].

Task API reference
Create a collection[^] DocumentClient.CreateDocumentCollectionAsync[^]
Get configured performance of a collection[^] DocumentQueryable.CreateOfferQuery[^]
Change configured performance of a collection[^] DocumentClient.ReplaceOfferAsync[^]
Get a collection by ID[^] DocumentClient.ReadDocumentCollectionAsync[^]
Read all the collections in a database[^] DocumentClient.ReadDocumentCollectionFeedAsync[^]
Delete a collection[^] DocumentClient.DeleteDocumentCollectionAsync[^]

Krishan Kumar 82 · Answer 2 · 2019-11-28T21:44:00

Hi,

I have used Cosmos DB in one of my project and I am using Mongo DB API. I was able to join two collections in that. If you are also planning to use Mongo DB API then here are the steps to follow :-

1) Enable feature called "Aggregation Pipeline"

The aggregation pipeline is a framework for data aggregation modeled on the concept of data processing pipelines. Documents enter a multi-stage pipeline that transforms the documents into aggregated results.

2) For using aggregation go through https://www.tutorialspoint.com/mongodb/mongodb_aggregation.htm

How can be join two docuemnts in cosmos db or how to get data from multiple collections

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Collection examples

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Task	API reference
Create a collection[^]	DocumentClient.CreateDocumentCollectionAsync[^]
Get configured performance of a collection[^]	DocumentQueryable.CreateOfferQuery[^]
Change configured performance of a collection[^]	DocumentClient.ReplaceOfferAsync[^]
Get a collection by ID[^]	DocumentClient.ReadDocumentCollectionAsync[^]
Read all the collections in a database[^]	DocumentClient.ReadDocumentCollectionFeedAsync[^]
Delete a collection[^]	DocumentClient.DeleteDocumentCollectionAsync[^]