A long time ago, I wrote an article talking about the differences between SQL and NoSQL databases. It was quite successful at the time. And I thought I showed, at that moment, a comprehensive list of database types.
Let me give you an example. Suppose you’re writing a social media app like Facebook or Instagram. You use a SQL database to better memorize relationships between people. Who they follow, what hashtags they follow.
Of course, in this app, you want to store data about user sessions. Let’s do that using a key-value store like Redis. Which will provide low latency and great performances.

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