JOIN in NoSQL databases

In this message, we will look at ways to connect collections in NoSQL databases mongodb, arangodb, orientdb and rethinkdb (in addition to being a NoSQL database, they also have a free version with a fairly loyal license). In relational databases, similar functionality is implemented using SQL JOIN. Despite the fact that CRUD operations in NoSQL databases are very similar and differ only in details, for example, in one database, create ({}) is used to create an object, on the other - insert ({}), and in third - save ({}), - the implementation of a sample of two or more collections in each database is implemented in completely different ways. Therefore, it will be interesting to perform the same sample on all databases. For all databases, we will consider obtaining a sample (a many-to-many relationship) for two tables.
 
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June ? 2018
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