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Grokking the System Design Interview
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SQL vs. NoSQL

In the world of databases, there are two main types of solutions: SQL and NoSQL (or relational databases and non-relational databases). Both of them differ in the way they were built, the kind of information they store, and the storage method they use.

Relational databases are structured and have predefined schemas like phone books that store phone numbers and addresses. Non-relational databases are unstructured, distributed, and have a dynamic schema like file folders that hold everything from a person’s address and phone number to their Facebook 'likes' and online shopping preferences.

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