Grokking the System Design Interview
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SQL vs. NoSQL

You are designing an online store. It needs to store orders, payments, user sessions, a product catalog, and an activity feed. Then someone asks the common question: "SQL or NoSQL?"

A weak answer names a product. A strong answer asks a few questions about the data, and then makes a choice. This lesson gives you those questions, explains the trade-offs behind them, and gives a sensible default for when no question forces a choice.

The Two Families

A relational database, also called a SQL database, stores data in tables made of rows and columns

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