Mongo and Mongoose

1. SQL databases are not best fit for hierarchical data storage.

2. examples:
   • MySql
   • Oracle
   • Sqlite
   • Postgres
   • MS-SQL

3. fits better for the hierarchical data storage as it follows the key-value pair way of storing data similar to JSON data.

4. MongoDB.

5. NoSQL database.

6. NoSQL database.

• Structured Query Language.
• A relational database is a digital database based on the relational model of data.
• tables.
• The database schema is its structure described in a formal language supported by the database management system.
• A NoSQL database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases.
• Use collections instead of tables.
• MongoDB stores data records as documents (specifically BSON documents) which are gathered together in collections
• MongoDB is more flexible, because it gives you the ability to store your data where ever you want.
• Disadvantages. NoSQL databases don’t have the reliability functions which Relational Databases have (basically don’t support ACID).