What are the 4 types of NoSQL databases?

SQL databases are better for multi-row transactions, while NoSQL is better for unstructured data like documents or JSON . SQL databases are also commonly used for legacy systems that were built around a relational structure.

MongoDB is better than other SQL databases because it allows a highly flexible and scalable document structure . For example: One data document in MongoDB can have five columns and the other one in the same collection can have ten columns.

ScyllaDB : A Monstrously Fast and Scalable NoSQL Database.