System Design Fundamentals
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Real-World Examples and Case Studies

The theory is easier to hold onto once you can point at systems that made the choice.

Where SQL Won

E-commerce platforms. Structured data with well-defined relationships is the norm here: tables for customers, products, orders and shipping details, all related. SQL makes querying and manipulating that efficient, which is what managing inventory, customer data and order processing actually needs.

Financial systems. Banking and trading platforms rely on SQL to maintain transactional consistency, guarantee data integrity and support complex queries

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