In the last chapter, we learned about various data models and created databases and tables or collections in those data models. It's time to ingest some data in those data models and do the query to see how effective it is.

In this chapter, we are going to cover the following topics:

• Performing CRUD operations in DocumentDB.
• Performing CRUD operations in MongoDB.
• Performing CRUD operations in Graph DB.
• Performing CRUD operations in tables (key value store).
• Performing CRUD operations in Cassandra.

Let's begin with Document DB queries.