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Data Systems⚪New

🧩 Data Models (SQL vs NoSQL)

The interface layer. How data is structured (Relational, Document, Graph) vs. how it is stored.

⬇️ Foundation

🔓 Unlocks Next

Query Languages (Declarative vs Imperative)

How we ask for data. Imperative tells the computer *how* to do it (loops); Declarative tells it *what* we want (SQL).

🎯 Mastery Criteria

✔Student can choose between a Graph model and a Relational model for a social network.

⚠️ Common Trap

NoSQL is always faster than SQL.