Documenting your code is very useful, because it allows you to refer back to the code documentation to understand your code much better. Also if you are working on a project with other people, you should document your code so your other peers can understand the code you wrote much faster without consuming time understanding your ideas.
SQL databases are primarily called relational database. Whereas, NoSQL databases are primarily called the non-relational database. Whenever you want to create an application where there will be a relationship between the tables, like one-to-many or many-to-many or one-to-one, then you can go with the SQL database. On the other hand, if the tables do not have any relations then you can go with the NoSQL database choice.
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