From what i know, higher order functions is, a function that takes another function as an argument and can use some built in keys like map or each inside it, just to make life much easier :) instead of writing so many functions over and over again.
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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